0.25w^6+1.25w^4+w^2=433.75
    4=（x/(14*10^-6)）^0.5*sin(1*10^-3/((x*14*10^-6)^0.5))
    4=（c/(14*10^-6)）^0.5*sin(1*10^-3/((c*14*10^-6)^0.5))
    x+x*0.09=100
    (68582.85+X)/(228855.72+68582.85+X)=0.5
    x^4+9x^2-45*45=0
    X=（1/3）*105%
    X=（1/3）*5%
    17.5*(x^2)+96*x-35-96=0
    (600-10x)(40+x-30)=10000
    (600-10x)(40+x-30)
    (600-10x)(40+x+30)
    [600-(2-40)10](x-30)=10000
    -70z*z+3100z=40000
    7x*3-4=147
    7x*3/4=147
    -( X+1)( X-3)=-x-1
    -0.1(x-4)^2+4=0
    16 a+4=2.4
    -0.15x^2+0.9x+2.4=0

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