（10-X）/(10-15)=8300/12210
    （10+x）（280-10x）等于3120
    4500/x=6000/X+10
    4500/x=X+10/6000
    x^2-25x-300=0
    x*2x+x*5=600
    x*2x+x*5=600
    x*(2x+5)=600
    x-1.0001^x=0
    x-1.0001^x=0
    -5x^2+2.5x+5=0
    4x+2（2x+3）=38
    5x+3(11-x)=45
    x/5+45-x/3=11
    5x+3(11-x)=45
    5x+3(11-x)=45
    20=0.72/（1+r）+0.864/(1+r)^2+0.9936/(1+r）^3+1.04328/(r-0.05)/(1+r）^3
    5x+3(11-x)=45
    1/5(800-x)=240-x
    Xx12-6480=0

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