a³-b³等于什么?(a-b)³呢
如题所述
第1个回答 2015-10-09
a³-b³
=a²-a²b+a²b-ab²+ab²-b³
=a²(a-b)+ab(a-b)+b²(a-b)
=(a-b)(a²+ab+b²)
(a-b)³
=(a-b)(a-b)²
=(a-b)(a²-2ab+b²)
=a³-2a²b+ab²-a²b+2ab²-b³
=a³-3a²b+3ab²-b³
如有疑问,请追问;如已解决,请采纳
追问加法呢
第2个回答 推荐于2017-05-09
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/f2deb48f8c5494ee3dcdfbb42bf5e0fe98257eb4?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
追答给出一组公式。
本回答被提问者采纳
第3个回答 2015-10-09
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/94cad1c8a786c9178ae7a794cf3d70cf3ac757b3?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
追问加法呢
追答![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/d8f9d72a6059252d5e2be9a9329b033b5bb5b95b?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
You're welcome.