√x+2y+(x-y+6)²=0,则x-2y的立方根是?

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√x+2y+(x-y+6)²=0,则x-2y的立方根是?
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√x+2y+(x-y+6)²=0,则x-2y的立方根是?
√x+2y+(x-y+6)²=0,则x-2y的立方根是?

√x+2y+(x-y+6)²=0,则x-2y的立方根是?
√x+2y+(x-y+6)²=0
x+2y=0 x-y+6=0
解得 x=-4 y=2
x-2y=-4-4=-8
x-2y的立方根=-2