（1➕x）^3乘（1-x）^2=1
    19.8×a×0.65=12.38
    13.8×a×0.65=8.12
    （0.1+X）*4X^2=3.44605*10^-11
    0.086*1000*X^2+3434*X-3434*1950=0
    0=（-6）²a+4
    r^23*(24*(r-1)-1)=1
    （a-16.9）÷a=0.2
    x^2/(2-x)^2/(1-0.5*x)=0.49
    (1+r)^23-1=24*r*(1+r)^23
    a（-6-6）²+4=0
    （a-13.9）÷a=0.2
    （a-10.9）÷a=0.2
    7n^2+7-10n=10
    7n^2+7-10n=0
    （a-9.9）÷a=0.2
    （432.4498355-x-22.47705822)*(481.4165558-324.7740359)=(x*2869.20633+22.47705822*503.666337-x*346.368116-22.47705822*346.368116)*0.995
    （a-6.9）÷a=0.15
    -1/9（x-6）²+4=0
    -1/9（x-6）+4=0

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