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
    （x-x/1.09*0.03）/1.09*0.03=123.46
    （x-x/1.09*0.03）/1.09*0.03=116.47
    （x-x/1.09*0.03）/1.09*0.03=123.46
    （x-x/1.09*0.03）/1.09*0.03=116.47
    x-x*0.08-[x-(x*0.08)] *0.13=1
    x-x*0.08-[x-(x*0.08)] *0.13=1

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