0.180448×2
    1000/5.657
    1000/7.041
    1000/6.399
    1000/6.737
    2.7^(-150)
    2.7^(-15)
    2.7^(-1500)
    91264000000×2.7^（-1500）
    =1/(1+exp(5.2319))
    1.44*3.14*8
    1.44*3.14*8
    1000/5.14
    1000/5.027
    (C(7,3))^9
    ln!(!(4))
    ((16.6×20.2)×2.59+1.4×8.58)/(16.6×26.53+10×2.92)
    cos!(A(2,5))
    cos!(A(2,7))
    (20×7.93+314.11×10.8+5372.48×22.24)/(136.16×10.99+2583.24×22.23)

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