已知根号2x+6+Y-2的绝对值+{z-5}²=0、则4x+y-9z=?
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已知根号2x+6+Y-2的绝对值+{z-5}²=0、则4x+y-9z=?
已知根号2x+6+Y-2的绝对值+{z-5}²=0、则4x+y-9z=?
已知根号2x+6+Y-2的绝对值+{z-5}²=0、则4x+y-9z=?
根号和平方相加为零,说明根号下的数为零,绝对值内的数为零,即2x 6=0,y-2=0 ,z-5=0解得x=-3,y=2,z=5.带入得4x y-9z=-55