Help me find some math problems.

An equation containing () is called an equation.

() 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