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1、4分之1x+3=5.4 兩邊乘4 x+3=21.6 x=21.6-3 x=18.6 2、(1-25%)x=1.5 0.75x=1.5 x=1.5÷0.75 x=2 3、60%x-3=9.6 0.6x=9.6+3 0.6x=9.9 x=9.9÷0.6 x=16.5
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