0.035÷e∧(-0.003132)=
    14.4÷（8.314×553）=
    arctan0.293+arctan1.415
    3--5
    -1+5
    4√2
    √2^2
    0.161-0.062-0.161ln320+0.062ln(400/320)
    2.759+0.161-0.062-0.161*ln320
    2.759+0.161-0.062-0.062ln320
    0.89*320*ln(400/320)
    3*20.9617
    6/0.2=
    arctan1.0866+arctan0.27166
    1.42*（1+3%-2%）
     6200/7.5415*108.62=
    0.2÷(1+1.74)
    10∧(4.74-4.5)
    0.2÷1.00316
    10∧(1.8×10∧(-5)-4.5)

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