14^(0.4/1.4)
    1-(1724.47-137.72)/(3458.7-137.72+(3458.7-2550)*0.1757/(1-0.1757))
    1-(17244.47-137.72)/(3458.7-137.72+(3458.7-2550)*0.1757/(1-0.1757))
    1-(2155.32-340.55)/((3095.8-340.55)+0.237*(3095.8-2737.26)/0.763)
    0.08*(2870.365-504.78)+0.52*(2389.405-137.72)
    3474.1-908.64+0.6*(3465.85-3012.22)
    2795.8+(2835.3-2795.8)*(167.65-160)/20
    2767.2+(2811.7-2767.2)*(167.65-160)/20
    7.659+(7.7482-7.659)*(167.65-160)/20
    6.8647+(6.9651-6.8647)*(167.65-160)/20
    11.9*220*125.32÷360
    11.9*220*125.32÷960
    0.518*465
    5.85/105.6
    3÷¼
    1/(0.08525*0.341)
    90-arctan(12.6/2)-arctan(12.6/5)-arctan(12.6/10)+arctan(12.6)
    2000^(1/3)
    20lg8-40lg2
    √(4^2+64)

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