11216521π
    20%+arctan（2.5×23.08%-0.5）×20%/π
    log(e^2,0.25)
    lne^(3/2)
    lne^3/2
    520^2+1314^2 1040*1314
    log(C(2,4),A(2,4))
    （1-7）*（（7/8）^1.134*7）
    （6+1）*（7/8）^6
    （7+1）*（7/8）^7
    （8+1）*（7/8）^8
    (209.4*60)*((sin(1.308216)+0.15*sin(2*1.308216)))
    tan(22.5)+sin(66.5)
    2sin(2/3)
    2sin2/3
    2^(-0.1)
    C(21,10)
    （28504.63+29311.84+38663.06)/3
    （29528+32197+32952+32505.66)/4
    C(42,9)

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