[(x-y)²+(x+y)(x-y)]÷2 其中x=3,y=1.5
3个回答
[(x-y)²+(x+y)(x-y)]÷2
=[x²-2xy+y²+x²-y²]÷2
=(2x²-2xy)÷2
=x²-xy
=x(x-y)
=3×(3-1.5)
=3×1.5
=4.5
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