-x^2y-xy^2
=-xy(x+y)
=-4*(-3)
=12
若x+y=4,xy=-3,则-x的平方y-xy的平方等于?
若x+y=4,xy=-3,则-x的平方y-xy的平方等于?
数学人气:384 ℃时间:2020-03-24 15:19:45
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