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先化简,后求值:【(x-y)²+(x+y)(x-y)】÷2x,其中x=3,y=-1.5
先化简,后求值,要答案和计算过程和公式
人气:342 ℃ 时间:2020-01-31 11:17:34
解答
[(x-y)²+(x+y)(x-y)]÷2x
=(x-y)(x-y+x+y)÷2x
=(x-y)×2x ÷2x
=x-y
=3-(-1.5)
=4.5
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