已知(x+2)²+|x+y+5|=0,求3x²y+{-2x²y-[-2xy+(x²y-4x²)]-xy}的值
已知(x+2)²+|x+y+5|=0,求3x²y+{-2x²y-[-2xy+(x²y-4x²)]-xy}的值
数学人气:543 ℃时间:2019-08-19 00:43:30
优质解答
x+2=0 x=-2x+y+5=0 3+y=0 y=-33x^2y+{-2x^2y-[-2xy+(x^2y-4x^2)]-xy}=3x^2y+{-2x^2y-[-2xy+x^2y-4x^2]-xy}=3x^2y+{-2x^2y+2xy-x^2y+4x^2-xy}=3x^2y-2x^2y+2xy-x^2y+4x^2-xy=xy+4x^2把x=-2,y=-3代入xy+4x^2.-2×-3+...
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