当x等于三分之五时,(1-x)²-4(1-x²)＋4(1＋x)²的值
人气：289 ℃ 时间：2020-05-18 16:44:09
解答
(1-x)²-4(1-x²)＋4(1＋x)²
=1-2x+x²-4+4x²+4+8x+4x²
=9x²+6x+1
=9×25/9+6×5/3-3
=25+10+1
=36
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