13.11c=（3+c）×7.92
    （50+x）/（25+x）=1.7
    4.74×n^20+6×n^19=29.293
    5.88×n^20+6×n^19=31.8912
    x^6-6x^5-15x^4-20x^3-15x^2-6x-1=0
    XX+2X-20=0
    (20+2X)(40-X)=1500
    (20+2X)(40-X)=1200
    (20+X)(40-X)=200
    5x-2(x-3)=1
    -x^3
    -x^3
    x-1/x+2
    (x-5)(x+1)(x+2)-2x+46=0
    (x+5x)×2=70
    x+5x=35
    （X-7）+(X-10)=51
    x^2-12.2x+32.8=0
    1+x*(1+x)=225
    954*（1+X）^3=990

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