(a-b)^3=(a-b);
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(a-b)³
=(a-b)²(a-b)
=(a²-2ab+b²)(a-b)
=a(a²-2ab+b²)-b(a²-2ab+b²)
=a³-2a²b+ab²-a²b+2ab²-b³
=a³-3a²b+3ab²-b³
拓展资料:
1、(a+b)³
=(a+b)²(a+b)
=(a²+2ab+b²)(a+b)
=a(a²+2ab+b²)+b(a²+2ab+b²)
=a³+2a²b+ab²+a²b+2ab²+b³
=a³+3a²b+3ab²+b³
2、(a+b)^4
=(a+b)³(a+b)
=(a³+3a²b+3ab²+b³)(a+b)
=a(a³+3a²b+3ab²+b³)+b(a³+3a²b+3ab²+b³)
=a^4+4a³b+6a²b²+4ab³+b^4
3、(a-b)^4
=(a-b)³(a-b)
=(a³-3a²b+3ab²-b³)(a-b)
=a(a³-3a²b+3ab²-b³)-b(a³-3a²b+3ab²-b³)
=a^4-4a³b+6a²b²-4ab³+b^4
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