20/3-20
    288×1.5
    ln1.470588
    ln2.1739
    ln2.5
    ln5
    ln0.2
    ln1/5=
    0^0
    1+1
    ln0.0033
    e^37.841807
    (466/27+466/17-466/39)÷(233/27+233/27-233/39)
    e^2
    (466/27+466/17-466/39)÷(233/27+233/27-233/39)
    7/24÷(-7/8)
    1/2×[1.0×π×（8.71×15+10.1×30+15×5.9+4.5×30+0.9×70+2.5×150）]
    1/2×[1.0×π×（8.71×15+10.1×30+15×5.9+4.5×30+0.9×70+2×150）]
    1/2×[1.0×π×（8.71×15+10.1×30+15×5.9+4.5×30+0.9×70+1×150）]
    1/2×[1.0×π×（8.36×15+9.5×30+5.8×15+13.11×30+1.3×70+1×150）]

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