已知|y-2x|+(x+y-3)² =0 计算y的-x次方已知|y-2x|+(x+y-3)² =0 计算y的-x次方
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已知|y-2x|+(x+y-3)² =0 计算y的-x次方已知|y-2x|+(x+y-3)² =0 计算y的-x次方
已知|y-2x|+(x+y-3)² =0 计算y的-x次方
已知|y-2x|+(x+y-3)² =0 计算y的-x次方
已知|y-2x|+(x+y-3)² =0 计算y的-x次方已知|y-2x|+(x+y-3)² =0 计算y的-x次方
解
/y-2x/+(x+y-3)²=0
∴
y-2x=0
x+y-3=0
将y=2x代入x+y-3=0
∴x+2x-3=0
∴x=1,y=2
∴y^(-x)
=2^(-1)
=1/2
∵|y-2x|+(x+y-3)² =0
∴y-2x=0
x+y-3=0
∴x=1
y=2
∴y的(-x)次方=2的(-1)次方=1/2