√2x/10=40
    √2x=40
    6*x^5-15*x^4+10*x^3
    X=1250*0.1/(31.36*0.000001*8)
    sinx/(1+x^2)=0.3
    sinx/(1+x^2)=0
    sinx/(1+x^2)=1/2
    sinx/(1+x^2)
    a*a+a-1=0
    (46454/64451)*0.5+(((2352+4444-x)/7050)*0.5)=x/8083
    X-X/1.01*0.01-(X-X/1.01*0.01)*0.043=91000
    (50-x)^2(100x-2500)=1000000
    1/2*x^2+1/2*x-1000=0
    5000x+2x^3-200x-125000-50x^2+5000x=5000
    5000x+2x^3-200x-12500-50x^2+5000x=5000
    x/（1-x）^2=5.0*1.1*10^(-6)
    (157+333.5)/31*x+217/31*(x+15)+124/31*(x+30)=2611
    （688+x）*0.86=382+x
    382x-688x=0.86
    6*x^(0.5)+5x=1

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