问题标题:
【x+y=3,xy=-2,求x(x+y)(x-y)-x{(x+y)的2次方}(≥▽≤)/~】
问题描述:
x+y=3,xy=-2,求x(x+y)(x-y)-x{(x+y)的2次方}(≥▽≤)/~
胡昊回答:
原式=x(x+y)[(x-y)-(x+y)]
=x(x+y)(-2y)
=-2xy(x+y)
=-2×(-2)×3
=12
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