(17+7/27+27+7/17-11-37/39)/(13+12/17+8+17/27-5-38/39)
    3*600+600/3*(80-25*3)
    3*600+600/3*3*3
    600*28+600/3*80
    200*1.6*10^(-19)/(0.06*9*10^(-31))
    2*sqrt2
    sqrt(8/sqrt3)
    4/sqrt3
    8/sqrt3
    15.937×（1＋10%）
    1.5:8
    A(3,3)
    0.2(0.2(0.2(0.2*4+0.8*3)+0.8(0.4*3+0.6*2))+0.8(0.4(0.2*3+0.8*2)+0.6(0.6*2+0.4)))+0.8(0.4(0.2(0.2*3+0.8*2)+0.8(0.4*2+0.6))+0.6(0.72+0.32))
    sqrt（32-8sqrt（3））
    4*0.2(1+0.2(1+0.2(1+0.2)+0.8*0.4)+0.8(0.4(1+0.2)+0.6*0.6))+0.8(0.4(1+0.2(1+0.2)+0.8*0.4)+0.6(0.6(1+0.2)+0.4*0.8))
    (1+sin36.6)/(1-sin36.6)
    (1+sin36.9)/(1-sin36.6)
    12.729330/18
    ln(1+e)
    ln(1+e)-0.5

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