Final answer:
To find con-free grammars for the given languages, we can represent each language with a context-free grammar.
Step-by-step explanation:
To find con-free grammars for the given languages, let's go through each one:
a) L = {n = m or m ≤ k}
This language can be represented by the following context-free grammar:
b) L = {n = m or m ≠ k}
This language can be represented by the following context-free grammar:
c) L = {k = n + m}
This language can be represented by the following context-free grammar:
d) L = { n + 2m = k}
This language can be represented by the following context-free grammar: