Kneel down to ask for the calculation problem of simplifying first and then evaluating in the first

1) 5a-2b+3b-4a-1 a= -1 b=2

2)7x²-3x²-2x-2x²=5=6x x= -2

3) 2x [6-2(x-2)] where x=-2

4) (5a 2a 3 4a ) a 3a a ), where a 2

5) 3x +4x-2x -x+x -3x-1 where x = -3

6)-3[y-(3x2-3xy)]-y+2(4x2-4xy)], where x=2, y=1 2

7) 2x -3xy+y -2xy-2x +5xy-2y+1 where x=22 7

8) 2x y + 4x y - 3xy - 5xy where x = 1 y = -1

9）9x+6x²2 -3(x-2/3x²2).where x=-2

10)1 4(-4x +2x-8)-(1 2x-1) where x=1 2

11）3x'y-[2x'y-(2xyz-x'z)-4x'z]-xyz, where x=-2, y=-3, z=1,12)(5a 2-3b 2)+(a 2+b 2)-(5a 2+3b 2), where a=-1, b = 1

13) 2 (a 2b + ab 2) -2 (a 2 b - 1) - 2 ab 2 -2 where a = -2, b = 2

14) (3x-5y) + (3+y) where x=5 and y=3

15）.[x+1)(x+2)-2] x, where x=-3

1, -9(x-2)-y(x-5) (1) simplify the whole formula. (2) When x=5, find the solution of y.

9+a) b-5(5+b) a (1) simplifies the whole equation. (2) When a=5 7, find the value of the formula.

g+62(g+b)-b (1) simplifies the whole equation. (2) When g=5 7, find the solution of b.

x+y)-5(4+x)+2y simplifies the whole formula.

5. (x+y)(x-y) simplify the whole formula.

ab+a a-b simplifies the whole formula.

7. Simplify the whole formula.

8. Simplify the whole formula.

9. (Simplify the whole formula.)

a+b=2, a-b=-1, find the value of 3(a+b)2(a-b)2-5(a+b)2 (a-b)2

1.-3(x2-xy)-x(-2y+2x)⑵(x5)•x3n-1+x3n•(-x)4

2.(x+2)(y+3)-(x+1)(y-2)⑷(2m2n)3•mn+(-7m7n12)0-2(mn)-4•m11•n8

3.(5x2y3-4x3y2+6x) 6x, where x=-2, y=2 (3mn+1)(3mn-1)-(3mn-2)2

3．3ab-4ab+8ab-7ab+ab=__

4．7x-(5x-5y)-y=__

5．23a3bc2-15ab2c+8abc-24a3bc2-8abc=__

6．-7x2+6x+13x2-4x-5x2=__

7．2y+(-2y+5)-(3y+2)＝_

8．(2x2-3xy+4y2)+(x2+2xy-3y2)=_

9．2a-(3a-2b+2)+(3a-4b-1)=_

10．-6x2-7x2+15x2-2x2＝__

1 Knowing a=x3-2x2+x-4, b=2x3-5x+3, calculate a+b=

2 Knowing a=x3-2x2+x-4, b=2x3-5x+3, calculate a-b=

3 If a=, b=, algebraic formula-(|a2b|-|ab2|) is a value

4．3a-(2a-3b)+3(a-2b)-b=__

5 Subtracting 3m4-m3-2m+5 from a polynomial gives -2m4-3m3-2m2-1, then this polynomial is equal to

6．-(2x2-y2)-[2y2-(x2+2xy)]=

7 If -3a3b2 and 5ax-1by+2 are homogeneous, then x= y=

8．(-y+6+3y4-y3)-(2y2-3y3+y4-7)＝_

9 The result of the simplified algebraic formula 4x2-[7x2-5x-3(1-2x+x2)] is

10．2a-b2+c-d3=2a+()d3=2a-d3-()c-()

4.-7x2+6x+13x2-4x-5x2=___

6.(2x2-3xy+4y2)+(x2+2xy-3y2)=___

8.-6x2-7x2+15x2-2x2=___

12.( 4xy+7x2-y2)=10x2-xy.

13.(4xy2-2x2y)-(=x3-2x2y+4xy2+y3.

14.Knowing a=x3-2x2+x-4, b=2x3-5x+3, calculate a+b=

15.Knowing a=x3-2x2+x-4, b=2x3-5x+3, calculate a+b=

16.If a=, b=, algebraic -(|a2b|-|ab2|) is a value

17.Subtract 3m4-m3-2m+5 from a polynomial to get -2m4-3m3-2m2-1, then this polynomial is equal to

18.-(2x2-y2)-[2y2-(x2+2xy)]=___

19.If -3a3b2 and 5ax-1by+2 are homogeneous, then x= y=

20.(-y+6+3y4-y3)-(2y2-3y3+y4-7)=___

……Simplify the original formula first, and then bring it in.

4.-7x2+6x+13x2-4x-5x2=__6.(2x2-3xy+4y2)+(x2+2xy-3y2)=_8.

6x2-7x2+15x2-2x2=__+4xy+7x2-y2)=10x2-xy.

13.(4xy2-2x2y)-(

x3-2x2y+4xy2+y3.

14.Knowing a=x3-2x2+x-4, b=2x3-5x+3, calculate a+b=

15.Knowing a=x3-2x2+x-4, b=2x3-5x+3, calculate a+b=

16.If a=, b=, algebraic -(|a2b|-|ab2|) is 17Subtract 3m4-m3-2m+5 from a polynomial to get -2m4-3m3-2m2-1, then this polynomial is equal to

18.-(2x2-y2)-[2y2-(x2+2xy)]=19.If -3a3b2 is the same as 5ax-1by+2, then x= y= 20

y+6+3y4-y3)-(2y2-3y3+y4-7)=_

Dear, it's very simple to use the distributive law, and it's much more difficult to simplify the evaluation of my weekly exam.