C(x,4)=6
    C(x,4)=6
    C(x,4)=6
    C(4,x)=6
    C(4,x)=9
    C(4,x)=4
    C(x,3)=4
    C(x,3)=4
    C(x,3)=4
    b*b+b=600
    x^3=9
    k ^2-48k+432=0
    arctanx=x
    ex*x^2-x-1
    x^2+x
    （x+7）（2x+9）=-15
    （x+7）（2x+9）=15
    x-1
    y=π
    arctanx=x

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