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最佳答案:7.65-4.8x=0.937.65-0.93=4.8x6.72=4.8xx=6.72÷4.8
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最佳答案:5x+8x(50-x)=6105x+400-8x=6108x-5x=400-6103x=-210x=-70
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最佳答案:(0.4x-15)/30=(0.6x+15)/50(0.4x-15)/3=(0.6x+15)/5(0.4x-15)*5=(0.6x+15)*32x-75=1.8