() is called solving equations.
The letters A, B and C represent the multiplication distribution rate of ().
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
Synchronous outline exercise
1. Multiple choice question:
(1) Write -2-(+3)-(-5)+(-4)+(+3) in the form of omitting brackets, and the correct one is ().
A.-2-3-5-4+3 B.-2+3+5-4+3
C.-2-3+5-4+3 D.-2-3-5+4+3
(2) The result of calculating (-5)-(+3)+(-9)-(-7)+ is correct ().
A.- 10 B.-9 C.8 D.-23
(3) The algebraic sum of-7,-12 and +2 is less than the sum of their absolute values ()
A.-38 B- 4 c . 4d . 38
(4) If +(b+3)2=0, the value of b-a- is ().
A.-4 B.-2 C.- 1 D. 1
(5) The following statement is true ()
A. the subtraction of two negative numbers is equal to the subtraction of absolute values.
B the difference between two negative numbers must be greater than zero.
C. A positive number minus a negative number is actually the algebraic sum of two positive numbers.
D. negative negative positive equals the absolute value of negative plus positive.
(6) Equation -3-5 cannot be read as ()
The difference between A.-3 and 5. The sum of b. 3 and -5.
Difference between c-3 and -5d-3 minus 5
2. Fill in the blanks: (4 ′× 4 =16 ′)
( 1)-4+7-9=- - + ;
(2)6- 1 1+4+2=- + - + ;
(3)(-5)+(+8)-(+2)-(-3)= + - + ;
(4)5-(-3 )-(+7)-2 =5+ - - + - .
3. Write the following form in the form of sum, without brackets, and say two pronunciation ways: (8 ′× 2 =16 ′)
( 1)(-2 1)+(+ 16)-(- 13)-(+7)+(-6);
(2)-2 -(- )+(-0.5)+(+2)-(+ )-2.
4. Calculation problem (6 ′× 4 = 24 ′)
( 1)- 1+2-3+4-5+6-7;
(2)-50-28+(-24)-(-22);
(3)- 19.8-(-20.3)-(+20.2)- 10.8;
(4)0.25- +(- 1 )-(+3 ).
5. When x =-3.7, y =- 1.8 and z =- 1.5, find the value of the following algebraic expression (5 ′× 4 = 20 ′).
( 1)x+y-z; (2)-x-y+z; (3)-x+y+z; (4)x-y-z。
Quality optimization training
( 1) (-7)-(+5)+(+3)-(-9)=-7 5 3 9;
(2)-(+2 )-(- 1 )-(+3 )+(- )
=( 2 )+( 1 )+( 3 )+( );
(3)- 14 5 (-3)=- 12;
(4)- 12 (-7) (-5) (-6)=- 16;
(5)b-a-(+c)+(-d)= a b c d;
2. When x=, y=- and z=- respectively, find the values of the following algebraic expressions;
( 1)x-(-y)+(-z); (2)x+(-y)-(+z);
(3)-(x)-y+z; (4)-x-(-y)+z。
3. Verify the equations of the following three groups of numbers:
Is it true that a-(b-c+d)=a-b+c-d?
( 1)a=-2,b=- 1,c=3,d = 5;
(2)a=23,b=-8,c=- 1,d= 1。
Computational problem
( 1)- 1-23.33-(+76.76);
(2) 1-2*2*2*2;
(3)(-6-24.3)-(- 12+9. 1)+(0-2. 1);
(4)- 1+8-7
Practical application of life
A water conservancy survey team swam 5 kilometers on the first day, 5 kilometers on the second day, 4 kilometers on the third day and 4.5 kilometers on the fourth day. Where is the survey team at this time? How many kilometers apart?
Reference answer:
Synchronous outline exercise
1.( 1)C; (2)B; (3)D; (4) a; (5)C; (6)C 2。 ( 1)4,(-7),(-9) (2)(-6),(- 1 1),(-4),2; (3)-5,8,2,3; (4)3,7,2;
3. Omit 4. ( 1)-4; (2)-80; (3)-30.5 (4)-5
5.( 1)-4; (2)4; (3)0.4; (4)-0.4.
Quality optimization training
1.( 1)-,+,+; (2)-,+,-,-; (3)+,+; (4)-,+,+; (5)-,+,-,-.
2.( 1) (2) (3) (4)-
3.( 1) and (2) both hold.
4.( 1)-
(2)
(3)-29.5
(4)- 1 Question (4) Note that the numbers with the same sign and the opposite sign should be combined separately.
Practical application of life
1. Upstream 1 km
Love teaching reflection article 1
I just finished learning the area of rectangles and squares. From the feedback of students' homework, on the one hand, stude