1/2×[1.2×π×（8.36×15+9.5×30+5.8×15+4.5×30+1.3×70）]
    0.65×1/2×[1.0×π×（6.09×15+9.2×15+13.11×30+1.1×70）]+563.25
    1/2×[1.0×π×（6.09×15+9.2×15+13.11×30+1.1×70）]
    5除以-5
    5除以-5
    1/2×[1.0×π×（8.36×15+9.5×30+5.8×15+4.5×30+1.3×70+2.5×150）]
    1/2×[1.0×π×（8.36×15+9.5×30+5.8×15+4.5×30+1.3×70+1×150）]
    1/2×[1.0×π×（8.36×15+9.5×30+5.8×15+4.5×30+1.3×70+1×150）]
    1.0×π×（8.36×15+9.5×30+5.8×15+13.11×30+1.3×70+1×150）
    (370000*1.425-300000)*(1.25*2)
    (370000*1.4-300000)*(1.25*2*1.04)
    (370000*1.4-300000)*(1.25*2*1.04)
    1.25*7
    76685668+78907
    20/3-20
    288×1.5
    ln1.470588
    ln2.1739
    ln2.5
    ln5

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