0.78x²+581.81x-13.14=0
    0.78x²+59x-13.14=0
    0.78x²+1.66x-13.14=0
    0.78x²+58.18x-13.14=0
    0.78x²+58.18x-13.22=0
    0.78x²+58.18x-13.21=0
    7.8x²+58.18x-13.21=0
    7.8x²+58.18x+13.21=0
    200=600-x
    8x^3-6x+1=0
    157×（1+x）^14=172.3
    100=300*x-280-（150+1）*x
    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

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