arcsin（30/-40）
    arcsin（30/50）
    arctan(4.8/6.4)
    arctan4.8/6.4
    arctan(9.6/12.8)
    arctane-arctan（1/e)
    4-(4÷2)
    1-1=
    -50+7.95/8%*(1-(1+8%)^(-9)）+37.95/(1+8%)^10
    35+8.025/8%*(1-(1+8%)^(-9))+18.025/(1+8%)^10
    1.98+0.26*49*49/52/52-0.49*49/52
    0.8-0.2*49/52
    1.53*0.04
    1.53*0.32
    （e250000-1）÷（e625000-1）=
    1.53*0.64
    1.64+0.24*2*2/3/3-0.32*2/3
    arccos0.6
    0.7568*0.9
    1/9 6/8

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