\[3 \cdot a - 2 \cdot (b + c)\ и\ a + 3 \cdot (b + c)\ \]
\[при\ a = 5;b + c = 3:\]
\[1)\ 3a - 2 \cdot (b + c) = 3 \cdot 5 - 2 \cdot 3 =\]
\[= 15 - 6 = 9.\]
\[2)\ a + 3 \cdot (b + c) = 5 + 3 \cdot 3 = 5 + 9 = 14.\]
\[3 \cdot a - 2 \cdot (b + c) < a + 3 \cdot (b + c).\]