(219.687+224.275)/2=
    (4+0.6)×(224.275-213.48)/(2×4)=
    0.7×1.43×10^3×(1.76×0.8)× (1.6×0.8)
    224.275×2.55=
    (2.4×(4-0.6-2×0.6)/2)-((2.4-0.6-2×0.6)/2)^2
    0.7×1×1.43×1200×600/1000
    （sin0.6+sin2.73）/3.14
    2101.222×(1-6×0.01644/4)/9.6=
    2101.222×(1+6×0.01644/4)/9.6=
    185.453×(1+6×0.033/4)=
    (1569.151+211.2)/9.6=
    572.63*（sin1+sin1.915）/3.14
    34.545/2101.222
    -50.509 +22.806×0.7=
    199.51×(1+6×0.033/4)=
    (1569.151+194.48)/8.84=
    57.959/（1569.151+194.48）
    44.778+18.83×0.7=
    sin1^3
    sin1+sin1.92

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