9*n+n*(n-1)/2*9+n*(9+n*9)+n*(n-1)/2*9+n*(9+2*n*9)+n*(n-1)/2*9=3402
    9*n+n*(n-1)/2*9+n*(9+(n-1)*9)+n*(n-1)/2*9+n*(9+(2*n-1)*9)+n*(n-1)/2*9=3402
    4*r*r+3.6r+1.8=0
    y*y-11y=12
    y*y-7y-10=0
    99-x/4=75
    x*exp(-x)
    2x^3+11x^2+20x+8=0
    x^2-x-1=0
    x^2-x+1=0
    x（x＋2）＝3x＋6
    -90-arctanx/20-arctanx/2=-180
    arctanx/20+arctanx/2=90
    x+3/x=6
    x^3+2x^2-7x-10=0
    (0.8-0.02x2)x(2-0.02)+(10-0.02x2)x(2.1-0.02)x14+(0.9-0.02)x2x(21-0.02)x8+(1.5-0.02x2)x2+(2.4-0.02x2)x(3.0-0.02)
    (0.8-0.02x2)x(2-0.02)+(10-0.02x2)x(2.1-0.02)x14+(0.9-0.02)x2x(21-0.02)x8+(1.5-0.02x2)x2+(2.4-0.02x2)x(3.0-0.02)=
    x÷8-x÷12=12
    4x²-36x+96
    12x²-72x+96

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