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最佳答案:X-2/7X=3/470%X + 20%X = 3.625% + 10X =4/5X - 15%X = 68X+3/8 X=1215X-3×5/21 =5/11
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最佳答案:30.8÷[14-(9.85+1.07)][60-(9.5+28.9)]÷0.182.881÷0.43-0.24×3.520×[(2.44-1.8)÷0.4+0