x/0.09+(2231253.92-x)/0.13=23712540.13
    （5.63-5.63/1.13*0.13+0.13）/7.03=x
    （5.63-5.63/1.13*0.13+0.15）/7.03=x
    （6.69-6.69/1.13*0.13+0.15）/7.03=x
    (x-x/1.09*0.03)*0.02=169282.04
    (x-x/1.09*0.03)*0.02=106470.87
    x＾4+x＾3-x+1=0
    x＾3+x＾2+1/x-1=0
    X²+6X=25
    300-70x+4xx=246
    (8-2x)(5-2x)=18
    （15+2x）（20+2x）=246+20×15
    (15-2x)(20-2x)=246+15*20
    (15-2x)(20-2x)=246
    3/(x*sqrt(x^2+1)*sqrt(1+(0.5x)^2))=1
    7511=1647*(1-r^11)/(1-r)-1647
    x^3+4x^2+5x+3=0
    x=18/16*2/3
    （X+3）÷0.87+3=1.5x
    cos(x)+cos(360x)＝2

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