X^2-9 x+18=0
    1/x（x+1）+1/（x+1）（x+2）+1/（x+2）（x+3）=1/x+3
    X^2-9x-9=0
    43.75x^2+5x-4500
    1/x-4-1/x-5=1/x-7-1/x-8
    1/x-4-1/x-5
    33*（1-x^11）/（1-x）=412
    3.74*（1-x^17）/（1-x）=175.8
    3.74*（1-x^11）/（1-x）=175.8
    181.3*（1-x^11）/（1-x）=4745
    6.15*（1-x^9）/（1-x）=124.6
    16.47*（1-x^16）/（1-x）=2450
    16.47*（1-x^16）/（1-x）=2450
    (2-1/2m)²=36
    0.8x-4.8=8/11x
    ((1+0.5*(0.08152927928*x)^2)^-0.5)*(0.3+0.7*exp(-0.378*(0.08152927928*x)^6)) =0.06967002131*x
    4*（1-q^10）/（1-q）＝89.92
    3.71*（1-q^10）/（1-q）＝89.92
    (2-1/2m)²=36
    sinx-cosx

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