（x-4）^2+（2x-6）^2
    5x^2-32x+52=6.25（x^2-10x+25）
    20x^2-128x+208=25x^2-250x+625
    5x^2-32x+52=0
    -50-（100+x）*1%=10
    8*(1-x^3)/(1-X)＝47
    8*(1-x^3)/(1-X)＝40
    3x^6－4x^3+x^2+x－1＝0
    x*84%=1000
    8-(4*sqrt21-4)=(1-(1+sqrt21)/2)x
    sqrt(x^2+44)+sqrt(x^2+12)=16
    6^x-5^x=11
    sinx=（6.3cosx+25）/(6.3tanx+35)
    abs(x-abs(3*x+2))=4
    84sinx=（75+6.3cosx）cosx
    x^2*（0.5x+0.05）=5.61*10^-12
    x^2（0.5x^2+0.05）=5.61*10^-12
    X*X*((0.01*X*X+1)/(X*X+1))^(1/2)=10000
    X*X*((0.01*X*X+1)/(X*X+1))^(1/2)=0
    16*10^3*x^2-125*x+225*10^(-3 )= 0

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