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求值:4x²y-[6xy-2(4xy-2)-x²y]+1,其中x=-1/2
人气:286 ℃ 时间:2020-05-27 03:21:59
解答
x=-1/2
4x²y-[6xy-2(4xy-2)-x²y]+1
=5x²y-6xy+2(4xy-2)+1
=5x²y+2xy-3
=5/4y-y-3
=y/4-3
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