0.05077*0.78+(1-0.05077)*92
    90-arctan(5/20)-arctan(5/5)
    0.9015*78+(1-0.9015)*92
    0.9015*2
    5730*lg(0.6276)/lg(0.5)
    lg 2
    3-lg(2.75)-2.75
    3-lg2-2
    3-lg 3-3
    3-lg(2.5)-2.5
    3-lg(2.5625)-2.5625
    3-lg(2.625)-2.625
    0.6875^3+1.1*0.6875^2+0.9*0.6875-1.4
    [(5/3)/(-1/2)-(-3)*0.5]/(-7/6)
    (5/3)/(-1/2)-(-3)*0.5
    (23/5)-(-14/3)-2.75+(-23/3)
    10+5*4
    7500+1120+820+1650+960+900+3800+7050+5000
    4-4
    2^4/1

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