-0.0299/0.00122*e（-0.00122*10000）+0.0299/0.00122*e（-0.00122*199.54）
    -0.2643/0.00207*e（-0.00207*199.54）+0.2643/0.00207
    0.5*（-0.5*2.71^4+3/8*2.71^3-7/2*2.71^2-（-0.5*1.29^4+3/8*1.29^3-7/2*1.29^2））
    2014.25×2015.75 - 2012.25×2017.75
    3.7×1.2×8.1×0.6×0.3÷1.11÷0.72÷2.7
    0.3×5×1.7×2.3×1.3×0.4÷0.51÷6.5÷0.92
    2.3×10.02
    42.7×0.98
    3.6×9.9
    66.8×2.7÷0.9
    2.4×2.5×0.2
    3.2÷5.6×0.7
    5.4÷1.25÷0.8
    1.55×0.82÷0.41
    12.5÷(0.2×2.5)
    6÷(0.6÷12.5)
    9.6÷1.25
    0.25×0.28
    0.48×1.25
    0.5×0.125×0.8×0.2

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