31x+24:15x=7:3
    31x+24:5x=7:3
    13x+24:5x=7:3
    63-5x=0
    -5x+63=0
    K-1
    1-k
    2-(2k+1)
    2+(2k+1)
    x+4+20+15%x+（x+15%x）*13%=2600
    45-x=2/3(60-x)
    X²÷(0.065－X)＝1.06×10∧－3
    16x^2-56x+33=0
    X^3-（345.657-2.1275×25）X^2-529.656×77.82^2 = 0
    X^3-（345.657-2.1275×0）X^2-529.656×77.82^2 = 0
    X^3-（345.657-2.1275×45）X^2-529.656×77.82^2 = 0
    X^3-（355.49-2.1275×45）X^2-308.3×77.82^2 = 0
    90+40x+2x=90
    X^3-（355.49-2.1275×25）X^2-308.3×77.82^2 = 0
    X^3-（355.49-2.1275×20）X^2-308.3×77.82^2 = 0

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