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当a=-2时,求多项式(2a-1)2次方(2a+1)2次方-(2-5a)2次方+(5a+2)2次方
人气:320 ℃ 时间:2019-08-21 07:30:28
解答
=[(2a-1)(2a+1)]²-(5a-2)²+(5a+2)² =(4a²-1)²-[(5a-2)²-(5a+2)²] =(4a²-1)²-(5a-2+5a+2)(5a-2-5a-2) =(4a²-1)²-10a×(-4)=(4a²-1)²...
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