1.a²+2ab+b²
2.b-a
3.a²-b²
4.a³+3a²b+3ab²+b³
5.a³-3a²b+3ab²-b³
6.a²+b²+c²+2ab+2ac+2bc
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answer:
1.a²+2ab+b²
2.b-a
3.a²-b²
4.a³+3a²b+3ab²+b³
5.a³-3a²b+3ab²-b³
6.a²+b²+c²+2ab+2ac+2bc