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4x^2y+8y-4+x^2y+1,其中x=-1/2,y=2
先化简 再求值,急
人气:395 ℃ 时间:2020-06-05 11:48:16
解答
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4x^2y+8y-4+x^2y+1
=5x^2y+8y-3
=5x(-1/2)²x2+8x2-3
=5x1/4x2+16-3
=2.5+13
=15.5确定吗?确定
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