Questions and answers on simplified evaluation of algebraic expressions

3.3ab-4ab+8ab-7ab+ab=______。

4.7x-(5x-5y)-y=______。

5.23 a3 BC 2- 15 ab2c+8 ABC-24 a3 BC 2-8 ABC = _ _ _ _ _ _。

6.-7x 2+6x+ 13 x2-4x-5x 2 = _ _ _ _ _ _。

7.2y+(-2y+5)-(3y+2)=______。

1 1.(2 x2-3xy+4 y2)+(x2+2xy-3 y2)= _ _ _ _ _ _。

12.2 a-(3a-2 b+2)+(3a-4 b- 1)= _ _ _ _ _ _。

13.-6x2-7x2+ 15x2-2x2=______。

14.2 x-(x+3y)-(-x-y)-(x-y)= _ _ _ _ _ _。

16.2 x+2y-[3x-2(x-y)]= _ _ _ _ _ _。

17.5-( 1-x)- 1-(x- 1)= _ _ _ _ _ _。

18.()+(4xy+7x2-y2)= 10x2-xy。

19.(4xy2-2x2y)-( )=x3-2x2y+4xy2+y3。

2 1. Given A=x3-2x2+x-4 and B=2x3-5x+3, calculate a+b = _ _ _ _.

22. given A=x3-2x2+x-4 and B=2x3-5x+3, calculate a-b = _ _ _ _.

23. If a=-0.2 and b=0.5, the value of the algebraic expression -(|a2b|-|ab2|) is _ _ _ _ _.

25. If a polynomial subtracts 3m4-m3-2m+5 to get -2m4-3m3-2m2- 1, then this polynomial is equal to _ _ _ _.

26.-(2 x2-y2)-[2 y2-(x2+2xy)]= _ _ _ _ _ _。

27. If -3a3b2 and 5ax- 1by+2 are similar terms, then x = _ _ _ _ _, and y = _ _ _ _ _.