82.5-20*lg(5/1)
    961.78-50.83
    （163.8-18.3-10.2）×（1.4-0.12）×0.24
    （163.8-18.3）×（1.4-0.12）×0.24
    （19.47×3.4+22.06×4.5）×0.24-13.14-3.78
    （163.8-0.3×34）×（1.4-0.12）×0.24
    163.8-0.3×34×（1.4-0.12）×0.24
    [(163.8+325.26-0.6×27-0.48×19) ×(3-0.6)]- 111.18-93.87
    908.83×0.24
    [(163.8+325.26-0.6×27-0.48×19) ×(3-0.6)]- 110.28-93.87
    1211.11×0.24-5.81
    arccos0.91284426019202528736684
    82.5-20*lg(5/1)
    arccos0.39642257433300935788906
    97.5-20*lg5
    1+1
    1/（1*2*3）+2/（3*4*5）+3/(5*6*7)+4/(7*8*9)+......+2011/(4021*4022*4023)
    824000/(0.7×16×1272)
    0.25*0.05/0.0345
    0.25*0.05+0.35*0.04+0.4*0.02

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