6/7/3
    0.15*8
    244176×2
    19^5-5×19^3+4×19-120
    19^5-19^3+4×19-120
    (-3²)
    -3²
    -3＾2
    5/1.0574+5/(1.0574)^2+5/(1.0574)^3+100/1.0574^3
    5/1.0577+5/(1.0577)^2+5/(1.0577)^3+100/1.0577^3
    5/1.057875+5/(1.057875)^2+5/(1.057875)^3+100/1.057875^3
    5/1.058+5/(1.058)^2+5/(1.058)^3+100/1.058^3
    7770➗（777➗3）
    0.5×0.4
    22+2
    3^5=
    √（25-12√3）
    √e
    300*（1-0.05）=
    52.46×1.15+2×10.5×√1.15

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