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
    x＋x×0.5=1280
    -3/20x^2+9/10x+2.4=0
    -3x^2+30x=63
    -3x+30x=63
    -3x+30x-63=0
    3000*0.01a*150*1.1+5000*0.05*96*(1-1.25*0.01a)=47250

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