1.8×0.41x＝749
    92.96=（（0.021*x^1.85+22.7）^0.5）*x^0.84
    34.5=（（0.021*x^1.85+11.5）^0.5）*x^0.84
    x=-0.5（0.5-1）²+3
    -0.5（x-1）²+3=2.6
    -0.5（x-1）²+3
    12x/16=10
    40r^2-3r-36=0
    X-6
    6/x＋3
    x+1/（1-x）+（x-1）/x=19/6
    x+1/（1-x）+x/x- 1=19/6
    (27-3x)x=90
    (27-3x)X=54
    (28-x)(10-x)=243
    4x(x-1)=16
    x^2(x-1)=16
    x(x-3)=54
    1653=80000*a*(1+a)
    1+x+x^2=1.96

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