3x的平方-《7x-(4x-3)-2x的平方》+2 其中x+ -5/2
人气:244 ℃ 时间:2019-10-11 01:29:45
解答
原式=3x²-(7x-4x+3-2x²)+2
=3x²-(3x+3-2x²)+2
=3x²-3x-3+2x²+2
=5x²-3x-1
=5*(-5/2)²-3*(-5/2)+1
=129/4
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