1/2-x-3/3=1
    1/2-x-3/3=1
    1/2-(x-3/3)=1
    X*35%+(60-X)*45%=60*39%
    0.88x=500X0.9十0.8（x一500）
    X^2-3.0625X+0.01838739=0
    x^2+8x+8
    x^2+48*x-14976=0
    10000x-xx=10
    10000x-xx=10
    x(10000-x)=11
    x(10000-x)=11
    48x^4-64x^3+8x^2-48x+27=0
    X*0.03=X-2900
    X*0.03=X-5153
    x(10000-x)=5000
    X*0.03=X-2315.6
    x-10＝x*0.4
    X*0.03=X-2315.6
    X*0.03=X-2315.6

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