12×1.3＋0.12×420＋5.5×0.88
    20/80
    2/8
    0.4÷(3.7÷1.2)×(2.5÷1.2)÷(10÷3.7)
    x^2－x＝2
    x+（x+8)+[(x+4)/4]+4*(x+4)=625
    2.009×43＋20.09×2.9＋200.9×0.28
    200.8×20.08-200.8×20.07
    3.19×54-15.2×5.4＋1.67×64
    3.8÷(78÷0.25)÷(0.25÷0.78)
    0.8×2×3.7×0.25×0.5×4×12.5
    247.6÷(2.476÷8.1)
    1.25×(0.893÷0.125)
    9(x+7)=90
    42x0.82+20x0.18=12250
    42x0.82+20x0.18=24500*.0.5
    42x+20x=24500
    0.85*42X+0.15*15X=33703*0.53
    0.85*42X+0.15*15X=19283*0.53
    0.85*42X+0.15*15X=14420*0.53

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