(9871.38×2285)/(6642.33×1975)
    （tan(45+40/2)）^2*2.71827^（3.1415926*tan40）
    466.74×1.558+2×22.6×1.248
    327.24×1.558+2×22.6×1.248
    (327.24-19.04×10)×1.402+2×0×1.192+19.04×10
    ((327.24-19.04×10)×1.402+2×0×1.192+19.04×10
    (309.24-18.04×10)×1.402+2×0×1.192+18.04×10
    309.24×1.662+2×29×1.289
    272.76×1.662+2×29×1.289
    (272.76)×1.352+2×11.4×1.163
    (0)×1.352+2×11.4×1.163
    2994.7564/352.64
    23×6.28×18.56+15×20.93
    (12458.58×964)/(6642.33×1175)
    ((23×9.6+22×2.5+19.1×2.4+22×0.5)/(9.6+2.5+2.4+0.5))×(8.72+6.28)+20
    (23×6.28×18.56+15×20.93)/(((23×9.6+22×2.5+19.1×2.4+22×0.5)/(9.6+2.5+2.4+0.5))×(8.72+6.28)+20)
    (376.84-22.04×10)×1.402+2×0×1.192+22.04×10
    327.24+18.7×7.46
    309.24+18×1
    272.76+19.2×1.9

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