化简:【(x-y)的2次方+(x+y)(x-y)】除以2x,其中x=3,y=1.5
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化简:【(x-y)的2次方+(x+y)(x-y)】除以2x,其中x=3,y=1.5
化简:【(x-y)的2次方+(x+y)(x-y)】除以2x,其中x=3,y=1.5
化简:【(x-y)的2次方+(x+y)(x-y)】除以2x,其中x=3,y=1.5
原式=[(x-y)(x-y)+(x+y)(x-y)]/2x
=(x-y)(x-y+x+y)/2x
=(x-y)·2x/2x
=x-y
=3-1.5
=1.5
化简后得x-y,代入数值得1.5
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