acos(4.45/5.8)
    1＋e2÷1-e2
    10.56-(0.46+0.76)*0.46*0.5*8.2-3.14*0.08*0.08*8.2
     2.4%-2.5%+2.4%*(-2.5%)
    2.4%-2.5%+2.4%*2.5%
    24%+(-2.5%)+24%*(-2.5%)
    9.4*(1-0.05)^20
    9463520042341*9999999999999999999999
    1052788969*101*89
    9498579767129*9999999999999999999999
    9498579767129*1111111111111111111111
    1056689261*101*89
    538987*1231*83*9
    1676321*27961*9091
    24%+(-2.5%)+24%*(-2.5%)
    0.188×（1.13/1.28）
    0.188×（1.13/1.28）
    1十1
    3000/(1.15)+3000/1.15^2+3000/1.15^3+3000/1.15^4-10000
    1-1

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