2004 年

$\dfrac{2^{2n}\cdot 9^n}{3^n}=$

If $x=\dfrac{y-2x}{2y}$, then $y=$

If $\mathrm{f}(x)=x^2-x+1$, then $\mathrm{f}(x+1)-\mathrm{f}(x)=$

$\sqrt{25a}-\sqrt{4a}=$

In the figure, the graph of $y=2x^2-4x+c$ passes through the point $(1,k)$. Find the value of $k$.

If the equation $4x^2+kx+9=0$ has equal positive roots, then $k=$

Solve $x(x-6)=x$.

If $\begin{cases}pq+2q=10\\4p+q=14\end{cases}$, then $q=$

The solution of $-2x<3-x$ or $3x+3>0$ is

If $a(2x-x^2)+b(2x^2-x)\equiv-5x^2+4x$, then $a=$