40/10*0.5
    20/40*1
    3.5×0.9×62+3.5×0.9×9×2
    2.305×9×(24+1.5)
    0.27×62×18
    3.7775×62×(24+1.5)
    0.27×62×18
    90/（40+35+25）
    40+35+25*0.6
    150-(25-15×3)×5
    √48÷√6一√18
    (30-4.21)/(30-5*sqrt2)
    log(3,27)
    170/146.49
    (25.49×10^3)/174
    (2×16.35×10^3)/978.6
    (1.57×10^6)/10155.6
    (1.04^31-1.04)/0.04
    1.04^31-1.04
    (1.04^30)*[1-(1/1.04)^30]/(1-1/1.04)

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