|3x+y|-(y-6)²=0计算2x²y-(3xy-5x²y)+4xy
问题描述：
|3x+y|-(y-6)²=0计算2x²y-(3xy-5x²y)+4xy
已知|3x+y|-(y-6)²=0计算2x²y-(3xy-5x²y)+4xy
答
|3x+y|-(y-6)²=0,则有
3x+y=0
y-6=0
解得
x=-2
y=6
2x²y-(3xy-5x²y)+4xy
=7x²y+xy
=xy（7x+1）
=-2×6×（7×（-2）+1）
=12×13
=156这两个是一道题前面那个式子是后面式子的已知条件就是这样