\[2 \cdot a - 3 \cdot b\ и\ 3 \cdot a - b\ при\ a = 8;b = - 3\]
\[1)\ 2a - 3b = 2 \cdot 8 - 3 \cdot ( - 3) =\]
\[= 16 + 9 = 25.\]
\[2)\ 3a - b = 3 \cdot 8 - ( - 3) = 24 + 3 = 27.\]
\[2 \cdot a - 3 \cdot b < 3 \cdot a - b.\ \]