1/2+1/4+1/8+1/16
    90-arctan6.97+arctan(6.97/2.8)-arctan(6.97/17.36)
    2^½
    2^-½
    2-½
    2½
    33^6
    5760-240*21
    90-arctan3.87
    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)

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