0.5*11.15*(17.79-4.75)^2-375.27-289.18-288.74-731.84=
    sqrt((sqrt(8*sqrt(5)-sqrt(72/(5*sqrt(5)))))^2+(4/(sqrt(8*sqrt(5)))-4/(sqrt(72/(5*sqrt(5)))))^2)
    72/(5*sqrt(5))+16*5*sqrt(5)/72
    1/6*11.15*(17.79-0.4)^3-(375.27*14.05+289.18*10.75+288.74*7.75+731.84*4.75)=
    72/(5*sqrt(5))+4*5*sqrt(5)/72
    tan12.660626
    6730*17^（-4/5）+25400
    0.1^ 2*3+0.3^ 2+0.5^ 2+0.2^ 2
    12/7+15/4—10/7
    51660^（1/3）*0.45
    51660^（1/3）*2.9
    73800*0.7
    73800^（1/3）*2.9
    sqrt(680.2)
    6/(0.1^2)+2/0.3^2+2/0.5^2+2/0.2^2
    2+2/5
    5/6+3/7+1/6+4/7
    9-3-4
    15-5-1
    sin2/（2（cos2-sin2））

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