acos-0.1375
    (6.04/2-0.6/2-0.6)×3.1-(3.1/2-0.6/2-0.6)^2
    3564.128/6.04/(217.28-20×1.1)=
    (6.2/2-0.6/2-0.6)×3-(3/2-0.6/2-0.6)^2
    3564.128/6.2/(217.28-20×1.1)
    (6.6/2-0.6/2-0.6)×2.8-(2.8/2-0.6/2-0.6)^2
    （-9）^1010*（-1/27）^673
    0.5×722.14×1.78×1.78=
    0.5×722.14×6.6/2×6.6/2-2345.418×(6.6×0.5-1.78)
    (2420.717+2345.418)/6.6
    (406.56+3564.128)/(2.8×6.6)
    (517.73+9001.72)/17.55
    (406.56+3564.128×2)/(2.8×6.6) =
    3564.128/6.6/(217.28-20×1.1)
    254.117×1000000/189216
    0.9×(600-16)×360=
    218.878×27.864/24=
    (224.275+213.48)/2=
    -1/7
    12345*2345+2469*38275；8127+6345+4563+2781；123456+234561+345612+456123+561234+612345

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