x*x+0.01x+0.00002=0
    480/x = 240/x+（1/3）+180x+（2/3）
    480/x＝240/x+1/3+180x + 2/3
    480/x-240/x-1/3-180x＝2/3
    x-1＝0
    240-1/3x-180x²＝2/3x
    180x²+x-240＝0
    4*sqrt(1/4+x*x)-x=3+1/2
    X/200+(17.5-X)/500=0.03
    ln2x/lnx＝2
    ln3x/lnx
    x一[(x一27)+(x一25)]=3
    2000*(22-x)=2400x
    1/2=1200x/2000*(22-x)
    0.079788×e^(((x-90)÷7)^2)=0.05699×e^(((x-100)÷5)^2)
    0.079788×e((x-90)÷7)^2=0.05699×e((x-100)÷5)^2
    ((x-90)÷7)^2-((x-100)÷5)^2=-0.6729
    ((x-160)÷6)^2-((x-180)÷8)^2=-0.5753527
    25x^2 +1431x+20736=0
    ((x-90)÷7)^2-((x-100)÷5)^2=-0.6729

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