2000*x=600000+（900+100）*x
    x*1000=600000+（900+100）*1000
    x*100=600000+（900+100）*1000
    6(3-x)^2=x^2-4x+2.25
    8x^2-56x+99=0
    （X-26）/X=0.35
    12x*2+28x-53=0
    （X-3)(X-9)=X-9
    100*x*222.64/(x*222.64+(1-x)*0.5*335.17)=90.444
    100*x*222.64/(x*222.64+(1-x)*0.5*335.17)=81.898
    100*x*222.64/(x*222.64+(1-x)*0.5*335.17)=83.690
    x^2+3x-2=0
    x/80+X/100=36
    x*x=x-1
    580=100X-4000-12(X*13/100-5)
    x÷(x+705.124)=7%
    12(X*13/100-5)
    580/(X-40-(X*13%-5)*12%)=100
    580/（0.8842X-39.4）=100
    acrtan√10

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