\(\text{Ta có:}8^4>8^3\Rightarrow\frac{4}{8^4}< \frac{4}{8^3}\Rightarrow\frac{3}{8^3}+\frac{3}{8^4}+\frac{4}{8^4}< \frac{3}{8^3}+\frac{4}{8^3}+\frac{3}{8^4}\Rightarrow A< B\)
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so sánh : A= \(\frac{3}{8^3}+\frac{3}{8^4}+\frac{4}{8^4}\)và B= \(\frac{3}{8^3}+\frac{4}{8^3}+\frac{3}{8^4}\)
\(\text{Ta có:}8^4>8^3\Rightarrow\frac{4}{8^4}< \frac{4}{8^3}\Rightarrow\frac{3}{8^3}+\frac{3}{8^4}+\frac{4}{8^4}< \frac{3}{8^3}+\frac{4}{8^3}+\frac{3}{8^4}\Rightarrow A< B\)