20* lg(0.2)-20* lg(24)－20* lg(0.12*24)
    20* lg(0.2)-20* lg(22)－20* lg(0.12*22)
    20* lg(0.2)-20* lg(20)－20* lg(0.12*20)
    20* lg(0.2)-20* lg(18)－20* lg(0.12*18)
    20* lg(0.2)-20* lg(15)－20* lg(0.12*15)
    20* lg(0.2)-20* lg(13)－20* lg(0.12*13)
    20* lg(0.2)-20* lg(10)－20* lg(0.12*10)
    20* lg(0.2)-20* lg(8.33)
    20* lg(0.2)-20* lg(5)
    20* lg(0.2)-20* lg(4)
    20* lg(0.2)-20* lg(3)
    20* lg(0.2)-20* lg(2)
    20*lg(70)+20* lg(1/1.3*0.1)+ 20*lg(1/7.073*0.1)-20* lg(0.12*0.1)-20* lg(0.02*0.1)-20* lg(1/0.205*0.1)-20* lg(1/23.894*0.1)
    20*lg(70)+20* lg(1/1.3*0.1)+ 20*lg(1/7.073*0.1)-20* lg(0.12*0.1)-20* lg(0.02*0.1)-20* lg(1/0.205*0.1)-20* lg(1/23.894*0.1)
    20*lg70+20* lg(1/1.3)
    20lg70
    lg3
    -90-arctan(0.12×100)-arctan(0.02×100)-arctan(1/0.205×100)-arctan(1/23.894×100)+arctan(1/1.3×100)+arctan(1/7.073×100) =
    -90-arctan(0.12×70)-arctan(0.02×70)-arctan(1/0.205×70)-arctan(1/23.894×70)+arctan(1/1.3×70)+arctan(1/7.073×70) =
    A(6187)

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