10000000000000000000000000000000000000001/157
    100000000000000000000000000000000000002/97
    24555/8185
    （259+200+34.69+91.8）×（1+8%）
    0.84÷3.5
    200×13%+120÷（1+13%）×13%
    arccos0.316
    e^π/2
    eπ/2
    arccos(0.785)=
    arccos(0.419)
    arccos(0.419)=
    log2∧18
    -1^4-(1-0.5)*(2/3)2/[-2-(-3)2]
    (-4)^2-3^3*(-1/3)^2
    arc sin 0.025
    arc sin0.0.025
    arctan(1.2/10.8)
    arctan(2/11)
    arctan(1/11）

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