1/(3.5*sqrt(1.501))
    1.225*1.225
    3.5*3.5/10
    90-arctan(sqrt(10)/2)-arctan(sqrt(10)/5)
    32*16/5-256/25
    1.42/(8%-3%)
    1/8 - 2/7 + 1/6
    3.14*{（65/2）/1000}²*80*10
    22580 +645+32048+800
    26600000+130960+1028000+9800+1250000
     190+920+560
    26600000-12832000-8438900
    266000000-12832000
    22446.7*11
    5924.20 +9284.50 +7238.000
    9284.5*7
    5924.2*2
    9.675/1.135
    8.54+1.135
    1.135-0.54

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