(X+2y)^3 (X-2y)^3 (X+y/2)^2 X^3-6x+27x-27 27+27x+6x^2+x^3 26/08/2021 Bởi Bella (X+2y)^3 (X-2y)^3 (X+y/2)^2 X^3-6x+27x-27 27+27x+6x^2+x^3
(X+2y)^3= x^3 + 6x^2y+12xy^2 + y^3 (x-2y)^3=x^3 – 6x^2y+12xy^2 – y^3 (x+ y/2)= x^2+ xy+ (y/2)^2 27+27x+6x^2+x^3= (x+3)^3 Bình luận
`(x+2y)^3` `=x^3+6x^2y+12xy^2+y^3` `(x-2y)^3` `=x^3-6x^2y+12xy^2-y^3` `(x+y/2)^2` `=x^2+xy+y^2/4` Hai câu cuối xem lại đề Bình luận
(X+2y)^3= x^3 + 6x^2y+12xy^2 + y^3
(x-2y)^3=x^3 – 6x^2y+12xy^2 – y^3
(x+ y/2)= x^2+ xy+ (y/2)^2
27+27x+6x^2+x^3= (x+3)^3
`(x+2y)^3`
`=x^3+6x^2y+12xy^2+y^3`
`(x-2y)^3`
`=x^3-6x^2y+12xy^2-y^3`
`(x+y/2)^2`
`=x^2+xy+y^2/4`
Hai câu cuối xem lại đề