ĐK:......Đặt $\sqrt{x-2}=a;\sqrt{x-1}=b$Ta có$:\frac{a+b+ab}{2b^2-3-b}\geqslant \frac{a^2-1}{6a-6}=\frac{a+1}{6}$
ĐK:......Đặt $\sqrt{x-2}=a;\sqrt{x-1}=b$Ta có$:\frac{a+b+ab}{2b^2-3-b}\geqslant \frac{a^2-1}{6a-6}=\frac{a+1}{6}$Kq $\frac{13}{4}<x\leq 20,313$