9.8x=9.8*-10.1+0.031*（20+x）÷0.053*0.355÷0.355÷2+0.034*20÷0.022*1.237*1.237÷2
    9.8x=9.8*4+50.7+0.031*（20+x）÷0.053*0.355÷0.355÷2+0.035*15÷0.022*0.816*0.816÷2
    9.8x=100
    36+（16-5x）^2=100
    lg(x)=-2.88
    -0.0029x2 + 0.8093x + 19.767=30
    42x^3 +31x^2 -42x+9=0
    5/7：x=4/9:2
    （1000+x）*0.97=x
    x=(x-3256.62)*50
    4x*x=14x-8
    （x-x/40）+（x-3870）=x/0.95
    x^4-10x^3+35x^2-50x+24=0
    4x^2-9x-9=0
    x^4-10x^3+35^2-50x+24=0
    x^4+3x^3 - 3x^2-2x + 1=0
    x^4-5x^3 - 3x^2-2x + 1=0
    x^4-5x^3 + 3x^2-2x + 1=0
    x^4-5x^3 + 2x^2-2x + 1=0
    x^4-5x^3 + 2x^2-1x + 1=0

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