a×0.60=18.9
    a×0.60=18.9
     (3319.79*x+2631.32*5000+1490.23*5000+4380.2*5000+4580.85*5000)/2-3319.79*x+4580.85*5000=-5500000
    (3319.79*x+2631.32*5000+1490.23*5000+4380.2*5000+4580.85*5000)/2-3319.79*x+4580.85*5000
    a×0.60=10.9
    (3319.79*x+2621.32*5000+1490.23*5000+4380.2*5000+4580.85*5000)/2-3319.79*x+4580.85*5000=-5500000
    10x^2+18x-1=0
    (x-131)/x=10%
    (7+5x)/(2x)+(2+6x)/(2+x)=11
    x*x-8*x-13=0
    x*x-8*x-13=0
    7x^2-11.5x-2.5=0
    19x＾2-760x+33972=0
    X-(0.015X)=100000
    (x-98.76)/x=10%
    (5*（31+x）+6)/(36+x) = 4.6
    (5*（31+x）+6)/(36+x) = 4.7
    (5*（31+x）+6)/(36+x) = 4.8
    (5*（31+x）+6)/(36+x)=4.9
    (5*（31+x）+6)/36+x=4.9

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