[(2n+1)^2+n^2][(2n+1)^2-n^2]
    [(2n+1)^2+n^2][(2n+1)^2-n^2]
    x^2=64
    [(2n+1)^2+n^2][(2n+1)^2-n^]
    tanx=x
    tanx=x
    atan(10*x)-atan(x)-atan(0.1*x)-atan(0.2*x)=-1.5708
    2x-5=x-1
    x（x+9）=3
    x（x+9）=3
    -atan(x)-atan(0.5*x)=-1.5708
    -atan(x)-atan(0.5*x)=-1.5708
    atan(10*x)-atan(x)-atan(0.1*x)-atan(0.2*x)=-1.5708
    (x-6)(x-2)(x-7)+4*(18-5*x)=0
    1+X
    2x*10-8=4*（40-x）
    x-5＝20
    2c²/1+c²/2/1＝1
    （10+16*x）*1/3-10* √1/3=0
    （10+16*x）*1/3-10* √1/3=0

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