350*2270.18
    1135.09*2
    133.54*10*0.85
    10.692*12.49
     14.76*0.94*0.9
    8.17*10.79
    10.692*10.61
     2*1000*0.9*6.6*0.9
    2*3.1415926/18*60/(16928.3*2*3.1415926)
    14.76*0.94*0.9*0.85
     60/4.066
    60/4.71
    tan（ π/2）
    tan π/2
    1.92*2
    146.8 + 97.16
    2.45 + 1.62
    225/4 + 225/5.5
    45+150+30
     6.8+30+15*4+15*2+20

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