计算①(a-2b+3c)²,②（a+b）²(a-b)²-(a-b)(a+b)(a²+b²)

计算①(a-2b+3c)²,②（a+b）²(a-b)²-(a-b)(a+b)(a²+b²)
计算①(a-2b+3c)²,②（a+b）²(a-b)²-(a-b)(a+b)(a²+b²)

计算①(a-2b+3c)²,②（a+b）²(a-b)²-(a-b)(a+b)(a²+b²)
①(a-2b+3c)²,
=a²+4b²+9c²-4ab+6ac-12ac;
②（a+b）²(a-b)²-(a-b)(a+b)(a²+b²)
=(a+b)(a-b)(a²-b²-a²-b²)
=-2b²(a²-b²)
=-2a²b²+2b^4;
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