因式分解(1+a²+b²-2a)²-(4b-4ab)(1+a²-b²-2a) 5
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(1+a²+b²-2a)²-(4b-4ab)(1+a²-b²-2a)
解:原式=[﹙1+a²-2a﹚+b²]²-4b﹙1-a﹚[﹙1+a²-2a﹚-b²]
=[﹙a-1﹚²+b²]²+4b﹙a-1﹚[﹙a-1﹚²-b²]
设 a-1=u
=﹙u²+b²﹚²+4bu﹙u²-b²﹚
=﹙u²-b²﹚²+4b²u²+4bu﹙u²-b²﹚
=﹙u²-b²﹚²+2×2bu﹙u²-b²﹚+﹙2bu﹚²
=﹙u²-b²+2bu﹚²
=[﹙a-1﹚²-b²+2b﹙a-1﹚]²
=﹙a²-2a+1-b²+2ab-2b﹚²
=﹙a²+2ab-b²-2a-2b+1﹚²
解:原式=[﹙1+a²-2a﹚+b²]²-4b﹙1-a﹚[﹙1+a²-2a﹚-b²]
=[﹙a-1﹚²+b²]²+4b﹙a-1﹚[﹙a-1﹚²-b²]
设 a-1=u
=﹙u²+b²﹚²+4bu﹙u²-b²﹚
=﹙u²-b²﹚²+4b²u²+4bu﹙u²-b²﹚
=﹙u²-b²﹚²+2×2bu﹙u²-b²﹚+﹙2bu﹚²
=﹙u²-b²+2bu﹚²
=[﹙a-1﹚²-b²+2b﹙a-1﹚]²
=﹙a²-2a+1-b²+2ab-2b﹚²
=﹙a²+2ab-b²-2a-2b+1﹚²
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