解方程:1、3/4x-35=(x-56)×4/3 2、5/6x+2/3(204-x)=1523、设零售价为每千克x元,共买了y千克,(0.84y+200×1.2y/1000)×0.25=(x-0.84)0.9y 求X 4、4/7x-100=3/7x+100 5、1.25x×0.8=646、1/4x+2/5(180-x)=60 7、12×0.1=

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