1.5x=（1.2-0.2x^2）^（-2.5）
    (x-10)(2x^2-40x-1)=x-16
    xxx-10x+3=0
    ㏑x=0.12
    19+6(xx-2x-3)=2x+1
    3xx-7x=-10
    a^2-4a+2=0
    3xx-7x=10
    36000/(x+60) = 10000/70
    30000/(x+60) = 10000/70
    40000/(x+60) = 10000/70
    x（10-0. 2x) +(50-x）（10-0. 2x) (0. 5) =100
    40000/(x+60） = 10000/70
    240x+12000 = x*x
    5t^2+（25-2.5t）t=100
    36000x+1800000 = 150x*x
    10000(x+60)+30000x = 150x(x+60)
    5t^2+（50-5t）t=100
    10000/x+30000/(x+60) = 150
    10000/x+20000/(x+60) = 150

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