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
    12.08×c=（3.4+c）×7.97
    abs(90-x)=abs(x-90) abs(90-7)=abs(x-90)
    abs(90-x)=abs(x-90)
    (50+x):(50-x)=5x
    (50+x):(50-x)=x
    (50+x):(50-x)=!(5)
    (50+x):(50-x)=0.|3:0.25
    (50+x):(50-x)=(1/3):(1/4)

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