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化简求值 [(x-y^2)+(x+y)(x-y)]÷2x.[(x-y^2)+(x+y)(x-y)]÷2x.化简求值 x=3 y=1.5

分类: 作业答案 • 2021-12-19 15:08:20
问题描述：

化简求值 [(x-y^2)+(x+y)(x-y)]÷2x.
[(x-y^2)+(x+y)(x-y)]÷2x.
化简求值 x=3 y=1.5

答

[(x-y^2)+(x+y)(x-y)]÷2x
=[x-y²+x²-y²]÷2x
=[x²+x-2y²]÷2x
=x/2+1/2+y²/2x

答

原式=[x-y²+x²-y²]÷2x
=[x²+x-2y²]÷2x
=x/2+1/2+y²/2x

答

[(x-y^2)+(x+y)(x-y)]÷2x=[x-y²+x²-y²]÷2x=[x²+x-2y²]/2x=(x+1)/2-y²/x ,将 x=3 y=1.5代人上式,原式＝(3+1)/2-1.5²/3＝2-2.25/3＝1.25.

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