2.5×3.14×2.94×120×24
    23×2340
    2.5×(37.2×29.54-3.14×〖1.47〗^2×24)
    (37.2+29.54)×2×18×177
    1.5×(37.2×29.54-3.14×〖1.47〗^2×24)
    1110/10.000003
    11*10/143*13
    280/4899*23
    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)

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