Áp dụng bđt Cauchy, ta có: $\frac{4}{4x+3}\geq \frac{3y-1}{3y+2}+\frac{2z-1}{2z+1}\geq 2\sqrt{\frac{(3y-1)(2z-1)}{(3y+2)(2z+1)}}; \frac{3}{3y+2}\geq 2\sqrt{\frac{(4x-1)(2z-1)}{(4x+3)(2z+1)}};\frac{2}{2z+1}\geq 2\sqrt{\frac{(4x-1)(3y-1)}{(4x+3)(3x+2)}} \rightarrow max{Q}=4,5$
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