1000000000000000000000000000000000000000000000000000000000000000000000000000000000000001/135080726389891
    arctan(0.5*1.74)
    arctan(0.2*1.74)=
    arctan0.2*1.74=
    10^4124
    380/（1+9%）*（1+6.9%）
    380/1+9%*（1+6.9）
    45+65
    10×20/3－20/3×20/3-50/7
     ((10.5%-4%)×0.0295-(11%-4%)×0.5×0.0295)/((10.5%-4%)×0.0295+(11%-4%)×0.1717556*0.1717556-(10.5%+11%-2×4%)×0.5×0.0295)
     ((10.5%-4%)-(11%-4%)×0.5)/((10.5%-4%)+(11%-4%)-(10.5%+11%-2×4%)×0.5)
    [(10.5%-4%)×0.0295-(11%-4%)×0.5×0.0295]/[(10.5%-4%)×0.0295+(11%-4%)×0.0289-(10.5%+11%-2×4%)×0.5×0.0295]
    [(0.5%-0.1%)×0.000625-(0.8%-0.1%)×0.5×0.000625]/[(0.5%-0.1%)×0.000625+(0.8%-0.1%)×0.0004-(0.5%+0.8%-2×0.1%)×0.5×0.000625]
    (0.15-0.05)×0.0064+(0.1-0.05)×0.01-(0.15+0.1-2×0.05)×0.5×0.1×0.08
    =(0.15-0.05)×0.64+(0.1-0.05)×0.01-(0.15+0.1-2×0.05)×0.5×0.1×0.08
    300+300/（1+5%）+300/（1+5%）100+5
    -⅓ x
    3－5/3
    tan(arccos0.65)
    tan(arccos0.6)

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