Cho 10 < a < 16 , 2 < b < 4 . Hãy tìm a + b ; a − b ; a . b ; a : b
Giải thích
\(\begin{array}{l}12 < a + b < 20\\6 < a - b < 14\end{array}\);
\(\begin{array}{l}20 < a.b < 64\\\frac{5}{2} < a:b < 8\end{array}\)
\(\begin{array}{l}12 < a + b < 20\\6 < a - b < 14\end{array}\);
\(\begin{array}{l}20 < a.b < 64\\\frac{5}{2} < a:b < 8\end{array}\)