11 + ab is the expression.
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ab increased by 2
It is an expression and a term that are of equal value
8ab + 3bc - 12 is an expression. It is neither an equation nor an inequality and, therefore, there can be no answer.
Commutativity.
If, as is normal, ab represents a times b, etc then ab + ab + cc = 2ab + c2 which is generally not the same as abc.