（1+0.08）*90
    1.2×（302.4/60）2/（2×（3.14×0.32）2）=
    2*（1+2）^2
    2*（1+2）+2*（1+2）*2
    e2+2e+9
    8417.41×1247.95×0.23
    0.38×0.4+0.2×0.3+0.05×0.3=
    0.38×0.4+0.2×0.3+0.5×0.3
    2/3*3=
    [1-9.24/（9.24-1.24)×（1-5%)]×100%
    [1-9.24/（9.24+5.76)×（1-0%)]×100%
    [1-9.24/（9.24+15)×（1-0%)]×100%
    （1067.11+21.34+23.42)×5%
    （1067.11+21.34)[(1+0.0435)^0.5-1]
    1067.11×0.02
    -20%+arctan(2.5×25%+0.5)×20%/π
    -20%+arctan(2.5×25%-0.5)×20%/π
    exp(-10)
    -20%+arctan(2.5×20%-0.5)×20%/π
    -20%+arctan(2.5×23.08%+0.5)×20%/π

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