(20+16×2.88+18.2×2.87)×0.79-2×13.4×0.90
    sqrt5120
    4/3×(186.7×2+276.86)/(186.7+276.86)
    1.1/3×(4×2+14.08)/(4+14.08)
    3.31/3×(25.87×2+94.42)/(25.87+94.42)
    3/4：9/16=
    1/2 (14.88+39.07)×2.11
    2.11/3×(14.88×2+39.07)/(17.88+39.07)
    4-(11/2)
    4-(-3/2)
    1/2 (14.88-39.07)×2.11
    1/3×(4.14-0.2)
    1/2 (4.14-0.2)×49.76
    (2.56×4.14)/(2.56+49.76)
    387.65- 110.79
    250.45-63.75
    148.42- 134.34
    121.29- 117.29
    171.45-77.03
    64.94-39.07

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