若y-x=-3,xy=28,试求x²y-xy²的值
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若y-x=-3,xy=28,试求x²y-xy²的值
若y-x=-3,xy=28,试求x²y-xy²的值
若y-x=-3,xy=28,试求x²y-xy²的值
x²y-xy²
=xy(x-y)
=28*3
=84
则y=4,x=7,得84
若y-x=-3,xy=28,试求x²y-xy²的值
若y-x=-3,xy=28,试求x²y-xy²的值
若y-x=-3,xy=28,试求x²y-xy²的值
x²y-xy²
=xy(x-y)
=28*3
=84
则y=4,x=7,得84