当x=3,y=-1/2时,求(x+y)(x²-xy+y²)-(x³-y³)的值求详细步骤

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当x=3,y=-1/2时,求(x+y)(x²-xy+y²)-(x³-y³)的值求详细步骤
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当x=3,y=-1/2时,求(x+y)(x²-xy+y²)-(x³-y³)的值求详细步骤
当x=3,y=-1/2时,求(x+y)(x²-xy+y²)-(x³-y³)的值
求详细步骤

当x=3,y=-1/2时,求(x+y)(x²-xy+y²)-(x³-y³)的值求详细步骤
(x+y)(x²-xy+y²)-(x³-y³)
=x^3+y^3-(x^3-y^3)
=2y^3
=-1/4