80400-(4300+870÷ 15) 240×78÷( 154- 1 15)
1437×27+27×563 〔75-( 12+ 18)〕÷ 15
2 160÷〔(83-79)× 18〕 280+840÷24×5
325÷ 13×(266-250) 85×(95- 1440÷24)
58870÷( 105+20×2) 1437×27+27×563
8 1432÷( 13×52+78) [37.85-(7.85+6.4)] ×30
156×[( 17.7-7.2)÷3] (947-599)+76×64
36×(9 13-276÷23) [ 192-(54+38)]×67
[(7. 1-5.6)×0.9- 1. 15]÷2.5 8 1432÷( 13×52+78)
5.4÷[2.6×(3.7-2.9)+0.62] (947-599)+76×64 60-(9.5+28.9)]÷0. 18 2.88 1÷0.43-0.24×3.5 20×[(2.44- 1.8)÷0.4+0. 15] 28-(3.4 / kloc-0/.25×2.4) 0.8×〔 15.5-(3.2 1 5.79)〕 (3 1.8 3.2×4)÷5 194-64.8÷ 1.8×0.9 36.72÷4.25×9.9 3.4 16÷(0.0 16×35) 0.8×[( 10-6.76)÷ 1.2]
( 136+64)×(65-345÷23) (6.8-6.8×0.55)÷8.5
0. 12× 4.8÷0. 12×4.8 (58+37)÷(64-9×5)
8 12-700÷(9+3 1× 1 1) (3.2× 1.5+2.5)÷ 1.6
85+ 14×( 14+208÷26) 120-36×4÷ 18+35
(284+ 16)×(5 12-8208÷ 18) 9.72× 1.6- 18.305÷7
4/7÷[ 1/3×(3/5-3/ 10)] (4/5+ 1/4)÷7/3+7/ 10
12.78-0÷( 13.4+ 156.6 ) 37.8 12-700÷(9+3 1× 1 1) ( 136+64)×(65-345÷23) 3.2×( 1.5+2.5)÷ 1.6
85+ 14×( 14+208÷26) (58+37)÷(64-9×5)
(6.8-6.8×0.55)÷8.5 (284+ 16)×(5 12-8208÷ 18)
0. 12× 4.8÷0. 12×4.8 (3.2× 1.5+2.5)÷ 1.6
120-36×4÷ 18+35 10. 15- 10.75×0.4-5.7
5.8×(3.87-0. 13)+4.2×3.74 347+45×2-4 160÷52
32.52-(6+9.728÷3.2)×2.5 87(58+37)÷(64-9×5)
[(7. 1-5.6)×0.9- 1. 15] ÷2.5 (3.2× 1.5+2.5)÷ 1.6
5.4÷[2.6×(3.7-2.9)+0.62] 12×6÷( 12-7.2)-6
3.2×6+( 1.5+2.5)÷ 1.6 (3.2× 1.5+2.5)÷ 1.6
5.8×(3.87-0. 13)+4.2×3.74
33.02-( 148.4-90.85)÷2.5
(1) Calculation problem:
( 1)23+(-73)
(2)(-84)+(-49)
(3)7+(-2.04)
(4)4.23+(-7.57)
(5)(-7/3)+(-7/6)
(6)9/4+(-3/2)
(7)3.75+(2.25)+5/4
(8)-3.75+(+5/4)+(- 1.5)
(9)(- 17/4)+(- 10/3)+(+ 13/3)+( 1 1/3)
( 10)(- 1.8)+(+0.2)+(- 1.7)+(0. 1)+(+ 1.8)+(+ 1.4)
( 1 1)(+ 1.3)-(+ 17/7)
( 12)(-2)-(+2/3)
( 13)|(-7.2)-(-6.3)+( 1. 1)|
( 14)|(-5/4)-(-3/4)|-| 1-5/4-|-3/4|)
( 15)(-2/ 199)*(-7/6-3/2+8/3)
( 16)4a)*(-3b)*(5c)* 1/6
There are still 50 questions, but there are no answers.
1.3/7 × 49/9 - 4/3
2.8/9 × 15/36 + 1/27
3. 12× 5/6 – 2/9 ×3
4.8× 5/4 + 1/4
5.6÷ 3/8 – 3/8 ÷6
6.4/7 × 5/9 + 3/7 × 5/9
7.5/2 -( 3/2 + 4/5 )
8.7/8 + ( 1/8 + 1/9 )
9.9 × 5/6 + 5/6
10.3/4 × 8/9 - 1/3
0. 12χ+ 1.8×0.9=7.2 (9-5χ)×0.3= 1.02 6.4χ-χ=28+4.4
1 1.7 × 5/49 + 3/ 14
12.6 ×( 1/2 + 2/3 )
13.8 × 4/5 + 8 × 1 1/5
14.3 1 × 5/6 – 5/6
15.9/7 - ( 2/7 – 10/2 1 )
16.5/9 × 18 – 14 × 2/7
17.4/5 × 25/ 16 + 2/3 × 3/4
18. 14 × 8/7 – 5/6 × 12/ 15
19. 17/32 – 3/4 × 9/24
20.3 × 2/9 + 1/3
2 1.5/7 × 3/25 + 3/7
22.3/ 14 ×× 2/3 + 1/6
23. 1/5 × 2/3 + 5/6
24.9/22 + 1/ 1 1 ÷ 1/2
25.5/3 × 1 1/5 + 4/3
26.45 × 2/3 + 1/3 × 15
27.7/ 19 + 12/ 19 × 5/6
28. 1/4 + 3/4 ÷ 2/3
29.8/7 × 2 1/ 16 + 1/2
30. 10 1 × 1/5 – 1/5 × 2 1
3 1.50+ 160÷40 (58+370)÷(64-45)
32. 120- 144÷ 18+35
33.347+45×2-4 160÷52
34(58+37)÷(64-9×5)
35.95÷(64-45)
36. 178- 145÷5×6+42 420+580-64×2 1÷28
37.8 12-700÷(9+3 1× 1 1) ( 136+64)×(65-345÷23)
38.85+ 14×( 14+208÷26)
39.(284+ 16)×(5 12-8208÷ 18)
40. 120-36×4÷ 18+35
4 1.(58+37)÷(64-9×5)
42.(6.8-6.8×0.55)÷8.5
43.0. 12× 4.8÷0. 12×4.8
44.(3.2× 1.5+2.5)÷ 1.6 (2)3.2×( 1.5+2.5)÷ 1.6
45.6- 1.6÷4= 5.38+7.85-5.37=
46.7.2÷0.8- 1.2×5= 6- 1. 19×3-0.43=
47.6.5×(4.8- 1.2×4)= 0.68× 1.9+0.32× 1.9
48. 10. 15- 10.75×0.4-5.7
49.5.8×(3.87-0. 13)+4.2×3.74
50.32.52-(6+9.728÷3.2)×2.5
5 1.-5+58+ 13+90+78-(-56)+50
52.-7*2-57/(3
53.(-7)*2/( 1/3)+79/(3+6/4)
54. 123+456+789+98/(-4)
55.369/33-(-54-3 1/ 15.5)
56.39+{3x[42/2x(3x8)]}
57.9x8x7/5x(4+6)
58. 1 1x 22/(4+ 12/2)
59.94+(-60)/ 10
1.
a^3-2b^3+ab(2a-b)
=a^3+2a^2b-2b^3-ab^2
=a^2(a+2b)-b^2(2b+a)
=(a+2b)(a^2-b^2)
=(a+2b)(a+b)(a-b)
2.
(x^2+y^2)^2-4y(x^2+y^2)+4y^2
=(x^2+y^2-2y)^2
3.
(x^2+2x)^2+3(x^2+2x)+x^2+2x+3
=(x^2+2x)^2+4(x^2+2x)+3
=(x^2+2x+3)(x^2+2x+ 1)
=(x^2+2x+3)(x+ 1)^2
4.
(a+ 1)(a+2)+(2a+ 1)(a-2)- 12
=a^2+3a+2+2a^2-3a-2- 12
=3a^2- 12
=3(a+2)(a-2)
5.
x^2(y+z)^2-2xy(x-z)(y+z)+y^2(x-z)^2
=[x(y+z)-y(x-z)]^2
=(xz+yz)^2
=z^2(x+y)^2
6.
3(a+2)^2+28(a+2)-20
=[3(a+2)-2][(a+2)+ 10]
=(3a+4)(a+ 12)
7.
(a+b)^2-(b-c)^2+a^2-c^2
=(a+b)^2-c^2+a^2-(b-c)^2
=(a+b+c)(a+b-c)+(a+b-c)(a-b+c)
=(a+b-c)(a+b+c+a-b+c)
=2(a+b-c)(a+c)
8.
x(x+ 1)(x^2+x- 1)-2
=(x^2+x)(x^2+x- 1)-2
=(x^2+x)^2-(x^2+x)-2
=(x^2+x-2)(x^2+x+ 1)
=(x+2)(x- 1)(x^2+x+ 1)
(2) Fill in the blanks:
(1) zero minus the inverse of a, the result is _ _ _ _ _ _ _ _; ② if a-b >; A, then B is _ _ _ _ _ _ _ _ _ _ _; (3) subtract-π from -3. 14, and the difference should be _ _ _ _ _ _ _ _; (4) The minuend is-12(4/5), with a difference of 4.2, so the minuend should be _ _ _ _ _ _ _ _ _ _ _ _; (5) If B-A
(3) True or false:
(1) When a number subtracts a negative number, the difference is less than the minuend. (2) When a number subtracts a positive number, the difference is less than the minuend. (3) Subtract any number from 0, and the difference is always equal to the reciprocal of this number. (4) If X+(-Y)=Z, then X=Y+Z (5) If 0, b|b|, then a-b >; 0
1) Multiple choice questions:
(1) It is known that A and B are two rational numbers. If their quotient a/b=0, then () (A)a=0 and b≠0 (B)a=0 (C)a=0 or b=0 (D)a=0 or b≠0. -1 and-1; 0 and 0; -2/3 and -3/2, where the reciprocal is () (a) only (b) only (c) only (d) both are (3) If a/|b|(b≠0) is a positive integer, then () |b| is the divisor of a (. B, then there must be () (a) A)A+b & gt;; a(B)a-B & gt; a(C)2a & gt; ab(D)a/b & gt; 1
(2) Fill in the blanks:
(1) When |a|/a= 1, a _ _ _ _ _ _ 0; When |a|/a=- 1, a _ _ _ _ _ _ 0; (fill in > 0, then a _ _ _ _ _ _ 0; (1 1) If ab/c0, then B _ _ _ _ _ _ 0; (12) if a/b >; 0,b/c(-0.3)4 & gt; - 106(B)(-0.3)4 >; - 106 >(-0.2)3(C)- 106 & gt; (-0.2)3 & gt; (-0.3)4(D)(-0.3)4 & gt; (-0.2)3 & gt; -106 (4) If A is a rational number and A2 >;; A, then the value range of A is () (a) A.
(2) Fill in the blanks:
(1)23, 3 is _ _ _ _ _, 2 is _ _ _ _ _ _, and the power is _ _ _ _ _ _ _ _; If 3 is regarded as a power, its cardinal number is _ _ _ _ _ _ _ _,
The index is _ _ _ _ _ _ _ _; (2) According to the meaning of power: (-2)3 stands for _ _ _ _ _ _ _ multiplication; (-3)2v represents _ _ _ _ _ multiplication; -23 means _ _ _ _ _. (3) The rational number whose square equals 36/49 is _ _ _ _ _ _ _; The cubic number equal to -27/64 is _ _ _ _ _ _ _ (4) Write a positive number greater than 10 as a* 10n (n is a positive integer), where the range of a is _ _ _ _ _ _ _ _, where n is an integer.
The number of digits is less than _ _ _ _ _ _, which is called scientific notation; (5) Write down the following numbers by scientific notation: 4000 = _ _ _ _ _ _ _ _ _ _ _ _; 950000=________________; earth
The mass is about 49800 ... 0g (28 bits), which can be recorded as _ _ _ _ _ _ _ _; (6) What are the numbers recorded by scientific notation, namely105 = _ _ _ _ _ _ _ _ _ _ _; 2* 105=______________; 9.7 *107 = _ _ _ _ _ _ 9.756 *103 = _ _ _ _ _ (7) The following numbers are natural numbers. 7* 106 is 3.78* 107 is _ _ _ _ digits; 10 10 is _ _ _ _ _ digits; (8) If rational number m 0, B0 (b) a-| b | > 0 (c) A2+B3 > 0 (d) A <; 0 (6) The minimum value of algebraic expression (a+2)2+5 is () (a) A = 0 (b) A = 2 (c) A =-2 (d) A0 (b) B-A >; 0 (c) A and B are reciprocal; (D)-ab (C)a
(5) The approximate value 1.20 obtained by rounding method represents the range of the exact number a ().
(A) 1. 195≤A & lt; 1.205(B) 1. 15≤a & lt; 1. 18(C) 1. 10≤a & lt; 1.30(D) 1.200≤a & lt; 1.205 (6) The following statements are correct: (a) The accuracy of similarity number 3.80 is the same as that of similarity number 38; (b) The number of significant digits of similarity number 38.0 is the same as that of similarity number 38. (c)3. 14 16 has three significant digits 3, 1 4 after being accurate to the percentile; (d) Write 123* 102 as 1.23* 104 with four significant digits.
(2) Fill in the blanks:
(1) Write the precision and significant figures of the following rounded approximations: (1) Approximate number 85 is accurate to _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ (3) The divisor of 5.2 million is accurate to _ _ _ _ _ _ _ _, and the effective number is _ _ _ _ _ _ _ _; (4) The approximate value of 0.20 is accurate to _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.
The divisor 2.7 183 is accurate to _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.
(3) True or false:
(1) The approximate value of 25.0 is exactly a dash, and the significant digits are 2,5; (2) Similarity number 4000 is as accurate as similarity number 4000; (3) The divisor 4000 is as accurate as the divisor 4 * 10 3; (4) The approximate value of 9.949 accurate to 0.0 1 is 9.95.
Exercise 8 (Level B)
(1) Use rounding method to approximate the following figures (three significant figures are required): (1) 37.27 (2) 810.9 (3) 0.0045078 (4) 3.079.
(2) Use rounding method to approximate the following numbers (accurate to thousands): (1) 37890.6 (2) 213612.4 (3)1906.57.
9.
9x^2(x- 1)^2-3(x^2-x)-56
=9x^2(x- 1)^2-3x(x- 1)-56
=[3x(x- 1)-8][3x(x- 1)+7]
=(3x^2-3x-8)(3x^2-3x+7
1.3.375+5.75+2.25+6.625
2.72 ÷9
3. 100 1-9036÷ 18
4.3.8×5.25+ 14.5
5.
6.
7.50 minus 12.5, divided by 2.5, what is the quotient?
8. The sum of 6 times of a certain number and 4 is equal to 19.25. Find a number. (Equation solution)
(2)
1. 15.36-3
2.2. 1×4.3+5.7×2. 1
3.(
4. 102×45-328
5.2.8×3. 1+ 17.6÷8
6. 19.2 minus the sum of 8.5 and 4.3, what's the difference?
7. 30% of a number is 6 and less than 18. Find this number.
(Equation solution)
(3)
1.6 1 10×47+639
2.3.5×2.7-52.2÷ 18
3. 18
4.3.375×0.97+0.97×6.625
5.(2
6. What is the quotient after subtracting the product of 2 and 1 and dividing it by 5?
7. A certain number is greater than 70, 10. How do you find a number?
(Equation solution)
(4)
1.6.54+2.4+3.46+0.6
2.95.6× 1.8+95.6×8.2
3.600-420÷ 12
7.344÷3.6-5.4×0.25
4.(2
5. 15.6÷[ 16×(0.25+0. 125)]
6. What is the quotient of158 minus 80 divided by 13?
7.7.5 If you subtract a number, the difference is 6. Find this number. (Equation solution)
(5)
1.300 1- 1998
2.3.9+
3.5000- 105×34
4.0. 15÷0.25+0.75× 1.2
5.( )×0.24
6.309 divided by the sum of 4 1.25 and 5.75, what is the quotient?
7. A number plus 1.2 equals 10. Find this number. (Equation solution)
(6)
1.
2.(25+ )×4
3.300-4263÷2 1
4.0.8 1÷0.25+5.96
5.
6.2.6- 1÷( )×
7. What is the quotient of the sum of five divided by the sum?
8. A number is 4.5 more than yourself. Find this number. (Equation solution)
(7)
1. 12
2.6.6+2
3. 1.8×3
4.403÷ 13×27
5. 1.5×4.2-0.75÷0.25
What's the difference between six MINUS three? 54 and divide by 0.5?
7. The sum of 65% of a number is 1.5. Find this number. (Equation solution)
(8)
1. 14
2.3.27×4 +3.27×5.7
3.
4.( 1.2+ )×4.5÷
5. 1025-768÷32
6.0.25×80-0.45÷0.9
7. What is the product of the number 13 greater than 47 times 5 minus 4.25?
8. The difference between 3 times a number minus 4.5 is 1.5. Find this number. (Equation solution)
(9)
1.0.25×2.69×4
2.4. 125×
3.2348+275× 16
4.
5.2.4+2.4×(5.375-3.375)
6.( 1
7. A number 2.4 less than a number is 1.8. Find this number. (Equation solution)
Name _ _ _ _ Student ID _ _ _ _
8.4.5 Subtract the product of 1.5 times 2.5. What's the difference?
( 10)
1.645-45× 12
2.(
3.0. 15+ 1.2÷0.24-0.45
4.3.75-(2.35+0.25÷ 1.25)
5.76× +23×25%+0.25
6. 10-2.87-7. 13
7.0.96+9.6×9.9
What's the difference between 8.7.5 and 5.7?
9. 40% of a number minus 9.6 equals 6.4. Find this number. (Equation solution)
( 1 1)
1. 12.37-3.25-6.75
2. 16×6.8+2.2× 16+ 16
3.40 1× 19+284
4.58.7- 16.65÷3.7
5.0.4×4.7×2.5+(2.3+5.3)
What is the sum of quotient of 6? 3.6 divided by 2.5 plus 12. 1?
7. 0.4 of a number is 0.5 more than 0.9. Find this number. (Equation solution)
( 12)
1.9.3 1- 1. 125-7.875
2.( )× 18
3.640+ 128×45
4.8.2× 1.6-0.336÷4.2
5.(
6.
What is the product of 400 times the sum of 7.0.62 and 0.08?
8. 2.5 times of a number is equal to the sum of 37 and 8. Find this number. (Equation solution)
. 3/7 × 49/9 - 4/3
2.8/9 × 15/36 + 1/27
3. 12× 5/6 – 2/9 ×3
4.8× 5/4 + 1/4
5.6÷ 3/8 – 3/8 ÷6
6.4/7 × 5/9 + 3/7 × 5/9
7.5/2 -( 3/2 + 4/5 )
8.7/8 + ( 1/8 + 1/9 )
9.9 × 5/6 + 5/6
10.3/4 × 8/9 - 1/3
0. 12χ+ 1.8×0.9=7.2 (9-5χ)×0.3= 1.02 6.4χ-χ=28+4.4
1 1.7 × 5/49 + 3/ 14
12.6 ×( 1/2 + 2/3 )
13.8 × 4/5 + 8 × 1 1/5
14.3 1 × 5/6 – 5/6
15.9/7 - ( 2/7 – 10/2 1 )
16.5/9 × 18 – 14 × 2/7
17.4/5 × 25/ 16 + 2/3 × 3/4
18. 14 × 8/7 – 5/6 × 12/ 15
19. 17/32 – 3/4 × 9/24
20.3 × 2/9 + 1/3
2 1.5/7 × 3/25 + 3/7
22.3/ 14 ×× 2/3 + 1/6
23. 1/5 × 2/3 + 5/6
24.9/22 + 1/ 1 1 ÷ 1/2
25.5/3 × 1 1/5 + 4/3
26.45 × 2/3 + 1/3 × 15
27.7/ 19 + 12/ 19 × 5/6
28. 1/4 + 3/4 ÷ 2/3
29.8/7 × 2 1/ 16 + 1/2
30. 10 1 × 1/5 – 1/5 × 2 1
3 1.50+ 160÷40 (58+370)÷(64-45)
32. 120- 144÷ 18+35
33.347+45×2-4 160÷52
34(58+37)÷(64-9×5)
35.95÷(64-45)
36. 178- 145÷5×6+42 420+580-64×2 1÷28
37.8 12-700÷(9+3 1× 1 1) ( 136+64)×(65-345÷23)
38.85+ 14×( 14+208÷26)
39.(284+ 16)×(5 12-8208÷ 18)
40. 120-36×4÷ 18+35
4 1.(58+37)÷(64-9×5)
42.(6.8-6.8×0.55)÷8.5
43.0. 12× 4.8÷0. 12×4.8
44.(3.2× 1.5+2.5)÷ 1.6 (2)3.2×( 1.5+2.5)÷ 1.6
45.6- 1.6÷4= 5.38+7.85-5.37=
46.7.2÷0.8- 1.2×5= 6- 1. 19×3-0.43=
47.6.5×(4.8- 1.2×4)= 0.68× 1.9+0.32× 1.9
48. 10. 15- 10.75×0.4-5.7
49.5.8×(3.87-0. 13)+4.2×3.74
50.32.52-(6+9.728÷3.2)×2.5
75÷〔 138÷( 100-54)〕 85×(95- 1440÷24)
80400-(4300+870÷ 15) 240×78÷( 154- 1 15)
1437×27+27×563 〔75-( 12+ 18)〕÷ 15
2 160÷〔(83-79)× 18〕 280+840÷24×5
325÷ 13×(266-250) 85×(95- 1440÷24)
58870÷( 105+20×2) 1437×27+27×563
8 1432÷( 13×52+78) [37.85-(7.85+6.4)] ×30
156×[( 17.7-7.2)÷3] (947-599)+76×64
36×(9 13-276÷23) [ 192-(54+38)]×67
[(7. 1-5.6)×0.9- 1. 15]÷2.5 8 1432÷( 13×52+78)
5.4÷[2.6×(3.7-2.9)+0.62] (947-599)+76×64 60-(9.5+28.9)]÷0. 18 2.88 1÷0.43-0.24×3.5 20×[(2.44- 1.8)÷0.4+0. 15] 28-(3.4 / kloc-0/.25×2.4) 0.8×〔 15.5-(3.2 1 5.79)〕 (3 1.8 3.2×4)÷5 194-64.8÷ 1.8×0.9 36.72÷4.25×9.9 3.4 16÷(0.0 16×35) 0.8×[( 10-6.76)÷ 1.2]
( 136+64)×(65-345÷23) (6.8-6.8×0.55)÷8.5
0. 12× 4.8÷0. 12×4.8 (58+37)÷(64-9×5)
8 12-700÷(9+3 1× 1 1) (3.2× 1.5+2.5)÷ 1.6
85+ 14×( 14+208÷26) 120-36×4÷ 18+35
(284+ 16)×(5 12-8208÷ 18) 9.72× 1.6- 18.305÷7
4/7÷[ 1/3×(3/5-3/ 10)] (4/5+ 1/4)÷7/3+7/ 10
12.78-0÷( 13.4+ 156.6 ) 37.8 12-700÷(9+3 1× 1 1) ( 136+64)×(65-345÷23) 3.2×( 1.5+2.5)÷ 1.6
85+ 14×( 14+208÷26) (58+37)÷(64-9×5)
(6.8-6.8×0.55)÷8.5 (284+ 16)×(5 12-8208÷ 18)
0. 12× 4.8÷0. 12×4.8 (3.2× 1.5+2.5)÷ 1.6
120-36×4÷ 18+35 10. 15- 10.75×0.4-5.7
5.8×(3.87-0. 13)+4.2×3.74 347+45×2-4 160÷52
32.52-(6+9.728÷3.2)×2.5 87(58+37)÷(64-9×5)
[(7. 1-5.6)×0.9- 1. 15] ÷2.5 (3.2× 1.5+2.5)÷ 1.6
5.4÷[2.6×(3.7-2.9)+0.62] 12×6÷( 12-7.2)-6
3.2×6+( 1.5+2.5)÷ 1.6 (3.2× 1.5+2.5)÷ 1.6
5.8×(3.87-0. 13)+4.2×3.74
33.02-( 148.4-90.85)÷2.5
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