1.2*(1.4*0.25+1 ）
     1.2*(1.4*0.25）+1
    （1.2*0.25）+1
    e^(-10)
    102.89*0.156
    10/(0.156*0.623)
    90-arctan(2)-arctan(2/5)
    lg22
    ln22
    cos60-tan55/3^9
    e^(-0.00001)
    8π/3
    arctan(（3/16）^(1/2))
    A(3,10)
    ((0.1*2.1)||10)*(15898378/86400)
    ((0.1*2.1)|10)*(15898378/86400)
    0.1*2.1*(15898378/86400)|10
    0.1*2.1*(15898378/86400)
    arctan25.55
    arctan0.083

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