sin（2/5）/（4-5）
    sin1/2+cos2
    1/2.3
    2.53^4-3.13^4
    27.5×0.51-27.5×0.15=
    e^15.464422
    (2 + 1 + 3 + 4 + 1 + 1 + 1 + 1 + 1 + 1 + 2 + 0 + 2 + 1 + 0)/15
    0.0001/0.1/0.01/0.1/0.01
    A(3,2)
    (500×12^3)/12+500×12×(134.93+0.512)^2+(500×12^3)/12+500×12×(134.93-0.512-12)^2+2×2×[(12×(400-12)^3)/12+12×(400-12)×1^2 ]
    (500×12×(-0.5×12)+500×12×(0.5×12+12)+2×2×(400-12)×12×[0.5×(400-12)+12+12])/(2×500×12+2×2×(400-12)×12 )
    500×12×(132.77-0.5*12)
    284758769/(400-12)
    284758769/(400+12-132.77)
    284758769/132.77
    500×12×(132.77-0.5×12)+2×(132.77-12)×12×0.5×(132.77-12)
    (500×12^3)/12+500×12×(132.77-0.5×12)^2+2×((12×400^3)/12+12×400×(12+0.5×400-132.77)^2)
    (500×12×0.5×12+2×400×12×(0.5×400+12))/(500×12+2×400×12)
    308.4×0.175
    C(4,2)*C(39,2)/C(43,4)

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