a,[5(x-y)^4-3(x-y)^3-4(x-y)^2]:(x-y) b,(9xy^2-6x^2y)(-3xy)+(6x^2y+2x^4):(x+y)^3 c,(x^2-2xy+y^2):(x-y) d, (27x^3+1):(9x^2-3x+1)

Question

a,[5(x-y)^4-3(x-y)^3-4(x-y)^2]:(x-y) b,(9xy^2-6x^2y)(-3xy)+(6x^2y+2x^4):(x+y)^3  c,(x^2-2xy+y^2):(x-y)   d,  (27x^3+1):(9x^2-3x+1)

quynhthu · Answer

`a,[5(x-y)^4-3(x-y)^3-4(x-y)^2]:(x-y)`

`=5(x-y)^3-3(x-y)^2-4(x-y)`

`b,(9xy^2-6x^2y)(-3xy)+(6x^2y+2x^4):(x+y)^3`

`=-27x^2y^3+18x^3y^2+(6x^2y+2x^4):(x+y)^3`

vẫn ko hiểu

`c,(x^2-2xy+y^2):(x-y)`

`=(x-y)^2:(x-y)`

`=x-y`

`d, (27x^3+1):(9x^2-3x+1)`

`= (3x+1)(9x^2-3x+1):(9x^2-3x+1)`

`= 3x+1`

chauhoangmy · Answer

Đ&aacute;p &aacute;n:    a,[5(x-y)^4-3(x-y)^3-4(x-y)^2]:(x-y)    =[(5x-5y)^4-(3x-3y)^3-(4x-4y)^2]:( x-y)   =[0^4-0^3-0^2]:(x-y)   =0:(x-y)

0 bình luận về “a,[5(x-y)^4-3(x-y)^3-4(x-y)^2]:(x-y) b,(9xy^2-6x^2y)(-3xy)+(6x^2y+2x^4):(x+y)^3 c,(x^2-2xy+y^2):(x-y) d, (27x^3+1):(9x^2-3x+1)”