x-（x-800）*0.2=1000
    x-（x-800）*0.2=2000
    4/X-19
    0.9A+150=1.5A
    x^2+35x+225=0
    x^2+34x+225=0
    ((x^3)^-2)=1000
    7600/(x+112*0.32)+10000/x+10000/x=150
    7600/(x+112*0.32)+10000/(x+112*0.2)+10000/x=150
    （cosx）^2=0.95
    （cosx）^2=0.9
    7600/(x+101*0.12)+10000/x+7600/x=150
    ((x^3)^-2)=1000
    15x=24x
    0.9A+150=1.5A
    0.493/(50/x+6.8)=0.507/(40/x+8.5)
    0.493/(50/x+6.8)=0.507/(40/x+8.5)
    0.507/(50/x+6.8)=0.493/(40/x+8.5)
    0.493/(50/x+6.8)=0.493/(40/x+8.5)
    0.493/(50/x+6.8)=0.493/(40/x+8.5)

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