发布网友 发布时间:2024-10-21 14:42
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热心网友 时间:2024-11-11 05:13
(x-y)(x-y)=(x-y)^2,所以[(x-y)^2+(x-y)(x-y)]=2(x-y)^2,则[(x-y)^2+(x-y)(x-y)]/(2x)=(x-y)^2/x=(x^2+2xy+y^2)/x
=x+2y+y^2/x 将x=3,y=1.5代入得:原式=3+1.5*2+1.5^2/3=6.75