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)
    3.14/2
    tan0.5
    sqrt((270/4)^2+36)
    （-2）^4*（2.56-1.27）^2+（-1.69）
    270/4+36
    50*360/2/3.1415926/3.258
    50*360/2/3.1415926/4.107
    lg20
    20lg0.7

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