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(1-7t-7t²-3t³)(1-2t-2t²-t³)-(t+1)^6
解:原式=﹙4+2t+2t²-3-9t-9t²-3t³﹚﹙2+t+t²-1-3t-3t²-t³﹚-[﹙t+1﹚³]²
=[﹙4+2t+2t²﹚-3﹙1+3t+3t²+t³﹚][﹙2+t+t²﹚-﹙1+3t+3t²+t³﹚]-[﹙t+1﹚³]²
=[2﹙2+t+t²﹚-3﹙t+1﹚³][﹙2+t+t²﹚-﹙t+1﹚³]-[﹙t+1﹚³]²
设n=﹙t+1﹚³=1+3t+3t²+t³ m= 2+t+t²
=﹙2m-3n﹚﹙m-n﹚-n²
=2m²-5mn+2n²
=﹙m-2n﹚﹙2m-n﹚
=[ 2+t+t² +2﹙1+3t+3t²+t³ ﹚][2﹙2+t+t² ﹚-1-3t-3t²-t³ ]
=(2t³+5t²+5t)(t³+t²+t-3)
=t﹙2t²+5t+5t﹚﹙t³-1+t²+t-2﹚
=t﹙2t²+5t+5t﹚[﹙t-1﹚﹙t²+t+1﹚+﹙t-1﹚﹙t+2﹚]
=t﹙2t²+5t+5t﹚﹙t-1﹚﹙t²+t+1+t+2﹚
=t﹙t-1﹚﹙t²+2t+3﹚﹙2t²+5t+5t﹚
解:原式=﹙4+2t+2t²-3-9t-9t²-3t³﹚﹙2+t+t²-1-3t-3t²-t³﹚-[﹙t+1﹚³]²
=[﹙4+2t+2t²﹚-3﹙1+3t+3t²+t³﹚][﹙2+t+t²﹚-﹙1+3t+3t²+t³﹚]-[﹙t+1﹚³]²
=[2﹙2+t+t²﹚-3﹙t+1﹚³][﹙2+t+t²﹚-﹙t+1﹚³]-[﹙t+1﹚³]²
设n=﹙t+1﹚³=1+3t+3t²+t³ m= 2+t+t²
=﹙2m-3n﹚﹙m-n﹚-n²
=2m²-5mn+2n²
=﹙m-2n﹚﹙2m-n﹚
=[ 2+t+t² +2﹙1+3t+3t²+t³ ﹚][2﹙2+t+t² ﹚-1-3t-3t²-t³ ]
=(2t³+5t²+5t)(t³+t²+t-3)
=t﹙2t²+5t+5t﹚﹙t³-1+t²+t-2﹚
=t﹙2t²+5t+5t﹚[﹙t-1﹚﹙t²+t+1﹚+﹙t-1﹚﹙t+2﹚]
=t﹙2t²+5t+5t﹚﹙t-1﹚﹙t²+t+1+t+2﹚
=t﹙t-1﹚﹙t²+2t+3﹚﹙2t²+5t+5t﹚
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