x²y=-2,
-x(x³y²-xy)
=-x[(xy)(x²y-1)]
=-x²y(x²y-1)
=-(-2)(-2-1)
=2(-3)
=-6
已知x的平方y=—2,求—x(x的3次方y的2次方—xy)的值
已知x的平方y=—2,求—x(x的3次方y的2次方—xy)的值
数学人气:628 ℃时间:2019-10-31 18:00:43
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