23+25/71
    (2/69+2/71)*23+25/71
    49.5*10 3/5-(50-1/2)*3/5
    44142+69376
    1/3+1/5+1/7+1/9+1/11+...+1/33+1/35+1/37
    （3/5+2.4*3/8）*45/2
    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

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