(（x-x/1.13*0.13）/7.13=0.015
    (（x-x/1.13*0.13）+0.05)/7.13=0.774
    （x-x/1.13*0.13）/7.13=0.654
    （（x-x/1.13*0.13）+0.05）/7.13=0.654
    （（x-x/1.13*0.13）+0.005）/7.13=0.654
    x+50*8*0.2+1.5x+10x+(x+10x)*17=586.7
    x²=20.3
    x^2-130x+2800=0
    100*x*222.64/(x*222.64+(1-x)*0.5*335.17)=92.993
    0.0636*x^2-0.0849*x=0
    （5x-400）-（4x-100）
    （5x-400）-（4x+100）
    5x-400-4x+100
    2.65x^2-34x+87.6=0
    2065x^2-34x-87.6=0
    6625x^2-x-1804668.8=0
    0.8*(0.4+tan(x)*tan(x))+(2.78*tan(x)+0.72)*sin(2*x)=1.21*tan(x)+(7.25*tan(x)+1.88)*cos(2*x)
    0.8*(0.4+tan(x)*tan(x))+(2.76*tan(x)+0.72)*sin(2*x)=1.21*tan(x)+(7.2*tan(x)+1.88)*cos(2*x)
    0.8*(0.4+tan(x)*tan(x))+(0.23*tan(x)+2.25)*sin(2*x)=1.21*tan(x)+(1.28*tan(x)+5.27)*cos(2*x)
    0.8*(0.4+tan(x)*tan(x))+(0.35*tan(x)+1.61)*sin(2*x)=1.21*tan(x)+(1.28*tan(x)+5.27)*cos(2*x)

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