90-arctan3.16
    e^(-3.14*0.46/sqrt(1-0.46^2))
    e^lg2
    800/50.24
    16*3.14
    2.35%×78.11+（1-2.35%）×92.13
    98.30%×78.11+（1-98.30%）×92.13=
    98.30%×78.11+（1-98.30%）×92.13
    59.04%×78.11+（1-59.04%）×92.13
    (0.02/78.11)/(0.02/78.11+0.98/92.13)
    (0.98/78.11)/(0.98/78.11+0.02/92.13)
    (0.55/78.11)/(0.55/78.11+0.45/92.13)
    arctan(-π/4)
    (1.2×1.5)/0.85×21.09
    (1.2×1.5)/0.85×53.42
    （lg2）^2
    180-90-arctan(sqrt(5))-arctan(0.2sqrt(5))
    2.7➗0.72
    √√3－1
    √3-1

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