Let's say a is 1, and b is 2. Is 1-2 the same as 2-1? I didn't think so. This is because subtraction is the same thing as adding a negative number, so by switching the a and b, you are also switching them between negatives and positives. However, -a-b is the same as -b-a.
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The expression is: ab-18
It is: ab+10
Using the communative property of both addition and multiplication, 11+ab could be rewritten as ab+11, 11+ba or ba+11.
a^(3) - b^(-3) = a^(3) - 1/b^(3) This factors to (a - 1/b)(a^2 + a/b + (1/b)^2))
a ⊕ b = ab' + a'b