x^4+x=1
    x^5+x^3+x=2
    x^5+x=1
    （1-x）^8=1/2
    x^2*(0.01x^2+1)*(0.04x^2+1)=900
    x*sqrt(0.01x*x+1)*sqrt(0.04x*x+1)=30
    1-cosx
    -lgx=3.22
    （x-10%）/（14%-10%） = （0-100）/（-150-100）
    0.85X＝500(1－0.12)+0.88(X－500)
    2200=（2x-1）*100
    2x-1
    1000×3.1%+32%×x=（1000+x）×3.5%
    2.4*（4.25+x）-2.4*4.25+x=8.05
    1/x+1.5/50=0.5/10
    -1/64x^3+9/16x^2-6x+16=0
    xx=2xx-xxx+11-2x
    xx=2xx-xxx
    xxxx/3+xxx/5+xx/7+x/9+1/11=0
    xxxx3+xxx/5+xx/7+x/9+1/11=0

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