Question

a的三次方加b的三次方等于?（a+b）的三次方等于?

Answer 1

1.a的三次方加b的三次方等于?

a³+b³=(a+b)(a²-ab+b²)

2.(a+b)的三次方等于?

(a+b)³=a³+3a²b+3ab²+b³

3.a的三次方减b的三次方等于?

a³-b³=(a-b)(a²+ab+b²)

4.(a—b)的三次方等于?

(a-b)³=a³-3a²b+3ab²-b³