Question

(a+b)³等于多少，化开公式

Answer 1

(a+b)³
=(a+b)(a+b)^2
=(a+b)(a^2+2ab+b^2)
=a^3+2a^2b+ab^2+a^2b+2ab^2+b^3
=a^3+3a^2b+3ab^2+b^3

追问

谢谢

追答

（a-b）³
=(a-b)(a-b)^2
=(a-b)(a^2-2ab+b^2)
=a^3-2a^2b+ab^2-a^2b+2ab^2-b^3
=a^3-3a^2b+3ab^2-b^3

Answer 2

(a+b)³=a³+b³2a²b+2ab²+a²b+ab²

Answer 3

=a3+3a2b+3ab2+b3
数字为上标

追问

那（a-b）³呢

追答

(a-b)³
=(a-b)(a-b)^2
=(a-b)(a^2-2ab+b^2)
=a^3-2a^2b+ab^2-a^2b+2ab^2-b^3

Answer 4

a³+3a²b+3ab²+b³

追问

那（a-b）³呢

Answer 5

a^3+3a^2*b+3a*b^2+b^3

追问

谢谢