x=91×(4.39-0.45)-67.83×(4.39-2.34)^2/6
    91+940.49+1445.64+1379.76=[(19.1×h+20)×0.576-2×24.73×√0.576]×(h-2.34)÷2×4
    91+940.49+1445.64=[(19.1×h+20)×0.576-2×24.73×√0.576]×(h-2.34)÷2×4
    5x＋3＝10
    91+940.49=[(19.1×h+20)×0.576-2×24.73×√0.576]×(h-2.34)÷2×4
    91=[(19.1×h+20)×0.576-2×24.73×√0.576]×(h-2.34)÷2×4
    0=-2.4*10^(-11)*x^3+4.93*10^(-7)*x^2-0.0035*x+10
    0=-2.4*10^(-11)*x^3+4.93*10^(-7)*x^2-0.0036*x+10
    0.7x=0.616*（x+15）
    ln(1+x)-2*x/3=0
    0=-2.4*10^(-11)*x^3+4.928*10^(-7)*x^2-0.00355*x+10.214
    6000（1+x）^(2)=8640
    1/2*X^(2)*X^(2)-5X^(3)+33/2X^(2)-20X=0
    103x^6-100x^5-111x+105=0
    x+2/9=7/9
    0=-2.4*10^(-11)*x^3+4.9*10^(-7)*x^2-0.0036*x+10
    0.3x+15=0.384*（x+10 ）
    6000*(1+x)^10=(1+x)^5*7000+5000
    x=91×(13.5-0.45)/4+940.49×(13.5-6.0)/4+1445.64×(13.5-10.5)/4-122.05×(13.5-2.34)^2/6
    x=91×(10.5-0.45)/4+940.49×(10.5-6.0)/4-89.5×(10.5-2.34)^2/6

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