1/12+1/4+1/40
    0.83333333333333333333333333333333^-3
    5*1.1/124%+5*1.1*1.1/124%/124%+5/24%/124%/124%
    3*1000*105%*（1+5.5%）^2+（5000-980*3）/1030*1183.36
    30000*1000*105%*（1+5.5%）^2+（5000-980*3）/1030*1183.36
    【【30000*1000*105%*（1+5.5%）^2+（5000-980*3）/1030*1183.36】-5000】/5000
    （4897.8-5037.6）/（4897.8-5000）
    2*50%+1.5*30%+2.5*20%
    2.5*115%/128%+2.5*115%*115%/128%/128%+2.5*115%*115%*1.02/（28%-2%）/128%/128%
    5*1.1/124%+5*1.1*1.1/124%/124%+5/24%/124%/124%
    （950.25-970）/（950.25-974.7）
    （7.5%-4.5%）+（7.9%-5%）+（8.3%-5.2%）
    -90-arctan1-arctan0.01＝
    2.36/1.08+2.71/1.08/1.08+2.98/8%/1.08/1.08
    2.36/1.08+2.71/1.08/1.08+2.99/8%/1.08/1.08
    2.36/1.08+2.71/1.08/1.08+2.99/8%/1.08/1.08
    0.8*0.2+1.2*0.3+1.5*0.5
    [（3%-7%）^2+(8%-7%)^2+(10%-7%)^2]/3
    √[（3%-7%）^2+(8%-7%)^2+(10%-7%)^2]/3
    （3%-7%）^2+(8%-7%)^2+(10%-7%)^2

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