1-e^(-1)
    2*-0.5-1
    2*0.5-1
    0.5e^（-1）
    279-1576=
    [1-2.47%]^800
    16.774e2+52.788e-62.308
    9.08/1.675
    6.92/1.195
    100000*734.1+1000000*2+20000000
    (4/(2^1.414))^3.414
    C(5,3)
    (4/2^√2)^2+√2
    (4/2^√2)^2+√2
    (4/(2^sqrt2))^(2+sqrt2)
    (4*（2^sqrt2）)^(2+sqrt2)
    （4*2^sqrt2）^（2+sqrt2）
    -0.67*0.612
    0.94*0.2
    49/52

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