108/64+(x-5/4)^2+（2x^2+5x+2-9/8）^2
     108/64+(x-5/4)^2=（2x^2+5x+2-9/8）^2
    x(9-x)=4.25
    x3+log2x
    (4-0.8t)^2*0.5=100
    (4-0.8t)^2*0.5=0
    ex*cos(x)-x=1.1
    ex*cos(x)-x=0.9
    e^x*cos(x)-x=0.9
    e^x*cos(x)-x=0.9
    e^x*cos(x)-x=1.1
    x^2-5x+4=0
    e^x*cos(x)-x=1.1
    10a+20(10-a)=150
    40a+20(10-a)=260
    2x+110=410
    686/128x^2-1750x-1152=0
    -240x+3600=80x
    3.09=(667-408037.19/x^3)/sqrt(25.3^2+1512321647.9/x^6)
    1.65=(667-408037.19/x^3)/sqrt(25.3^2+1512321647.9/x^6)

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