0=3*1.5²+（3+x）*1.5+x
    0＝3*1.5²-（3+x）*1.5+x
    14＝-0.02x²+18
    -5＝x²-2x-3
    12.02c=（3.4+c）×7.98
    151×7.95-12=150c
    151.2×7.95-1.2×12=150c
    s(s^2+20s+200)=(s+2)(3s^2+40s+200)
    x^3-30x^2+200x+2000=0
    50%*（X+1/2X）=240
    1/x+2/(x-2)=1/(x-5)
    1/x+1/(x-0.5)=1/(x-1)
    x^2*(x^4+4x^2+36)=36
    x^2(x^2+1)(0.0625x^2+1)=6.25
    6400/x+x+0.5*x=200
    101.325*x^2/［（1-x）*（10+x）*100］=2.009
    7x+4
    3x²+2x+8=92
    x^2-5x+6=0
    12.02×c=（3.3+c）×7.97

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