\[\boxed{\mathbf{3.}\mathbf{200}}\]
Пояснение.
Решение.
\[\textbf{а)}\ 47a + 13a = (47 + 13) \cdot a =\]
\[= 60a\ \]
\[\textbf{б)}\ 34y + 6y = (34 + 6) \cdot y =\]
\[= 40y\]
\[\textbf{в)}\ x + 61x = (1 + 61) \cdot x = 62x\]
\[\textbf{г)}\ t + 65t = (1 + 65) \cdot t = 66t\]
\[\textbf{д)}\ 47p - 27p = (47 - 27) \cdot p =\]
\[= 20p\]
\[\textbf{е)}\ 92g - 90g = (92 - 90) \cdot g =\]
\[= 2g\]
\[\textbf{ж)}\ 102l - l = (102 - 1) \cdot l =\]
\[= 101l\]
\[\textbf{з)}\ 10\ 000k - k =\]
\[= (10\ 000 - 1) \cdot k = 9\ 999k\]