(3a-b-4)x|+|(4a+b-3)y|=0(3a-b-4)x=0且(4a+b-3)y=0所以3a-b-4=0 4a+b-3=0a=1 b=-1|2a|-3|b|=-1
若|(3a-b-4)x|+|(4a+b-3)y|=0成立且xy≠0求|2a|-3|b|的值
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