Question

(a-b)^3;等于什么

Answer 1

最佳答案 其实如果你公式记不下来的话，你要懂得变通，比如(a-b)^3=(a-b)^2×（a-b）=(a^2-2ab+b^2)(a-b)=a^3-a^2b-2a^2b+2ab^2+ab^2-b^3=a^3-b^3-3a^2b+3ab^2
（a-b）^4=(a-b)^3*(a-b)=(a^3-b^3-3a^2b+3ab^2)(a-b)=a^4-a^3b-ab^3+b^4-3a^3b+3a^2b^2+3a^2b^2-3ab^3=a^4+b^4-4a^3b-4ab^3+6a^2b^2
那么显而易见a3-3a2b+3ab2-b3=(a-b)3

Answer 2

(a-b)^3=(a-b)^2×（a-b）
=(a^2-2ab+b^2)(a-b)
=a^3-a^2b-2a^2b+2ab^2+ab^2-b^3
=a^3-b^3-3a^2b+3ab^2
我是老师 谢谢采纳

Answer 3

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

Answer 4

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

Answer 5

a^3-b^3-3a^2b+3ab^2