若|2x-y|+(x-2y-4)2=0则(x-y)2=( )l
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若|2x-y|+(x-2y-4)2=0则(x-y)2=( )l
若|2x-y|+(x-2y-4)2=0则(x-y)2=( )
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若|2x-y|+(x-2y-4)2=0则(x-y)2=( )l
2x-y=0
x-2y-4=0
解得:x=-4/3,y=-8/3
(x-y)²=( 16/9 )
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