（1/40）*6-（7/24）*（6*6）+（9/8）*（6*6*6）-（41/24）*（6*6*6*6）+（57/20）*（6*6*6*6*6）
    √(44.18^2+(44.18+24.24)^2 )
    √(256.4^2+(256.4+24.24)^2 )
    3.74*1021*5.32/1.3*21*1.55*1.4
    3.74*1021*5.32/2*21
    6268*4*0.3*1.35*1.55*1.5
    6268*4*1.6*1.35*1.55*1.5
     1674*(1.88+0.96+0.9)
    arccos(111/120)
    arccos(111/120)
    48.16×0.6=
    1/3.3^1.5*24
    arccosπ/2
    arccos2/π
    4/7×5/8×7/4
    cos30＋tan60
    cos30＋tan60
    155/187
    565875368539986368524663896368828856996953685553354×9
    565875368539986368524663896368828856996953685553354×9

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