x/1-x=200/300
    x/2-x=40.36/111.5
    2.4+x+2.4x=3.9
    3.84=1.67^(x+1)
    X2*x4
    x＾2-16x＋60＝0
    x＾2＋3x＋2＝0
     5-n=9n+15
    x∧2-6x+12√3
    y（24-2y）＝45
    x∧2-6x+12√3
    y（22-2y）=45
    X+（x/2)=42
    1.06^n=5/6/（100+5/6/100）
    10*(1+6%)^n+5/6%*((1+6%)^n-1)=100
    （10+x）（500-10x）=8000
    10*(1+6%)^n+5/6%*((1+6%)^n-1)
    10×(1+6%)^n+5/6%×[(1+6%)^n-1]=100
    3.2x^(2)-1.352x+2.2×0.001=0
    25+1/4*t*t-5t+9/25*t*t=t*t

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