Question

化简（a^2-ab+2b^2)-2(-a^2+b^2) -2（x-3y）+3（2x-y)-4(2x+3y)

(x+y)-[3x+(-x+y)] (3a-2b)+(5a-7b)-2(2a-4b)
(3/4x^3-1/3xy^2+1/2x^2y-2/5y^3)+((-y^3)+1/2x(y^2)-(1/3x^2)y-3/5(y^3)
((-x^2)+2xy-(y^2)-2(xy-3x^2)+3(2y^2-xy)

Answer 1

(x+y)-[3x+(-x+y)] (3a-2b)+(5a-7b)-2(2a-4b)
(3/4x^3-1/3xy^2+1/2x^2y-2/5y^3)+((-y^3)+1/2x(y^2)-(1/3x^2)y-3/5(y^3)
((-x^2)+2xy-(y^2)-2(xy-3x^2)+3(2y^2-xy)

Answer 2

-3x+2y 4a-5b 加分帮你做后面的~

Answer 3

-x
4 a - b
(3 x^3)/4 - xy^2/3 + (x^2 y)/6 + (x y^2)/2 - 2 y^3
5 x^2 - 3 xy + 5 y^2

追问

还有两道a^2-ab+2b^2)-2(-a^2+b^2)
（x-3y）+3（2x-y)-4(2x+3y)
第三题化简

追答

3 a^2 - ab

-x - 18 y

Answer 4

www

Answer 5

面的~