A. Prove and make an illustration on theorems 4-6. 4. If a/b and b/a then a = +b 5. If a/b and a > 0, b>0 then a ≤ b. 6. If a/b if and only if ma/mb, m = 0. B. Prove the following: 1. If a/c and a + b = c, then a/b. 2. ab if and only if ac bc, c# 0 3. If alb and alc, then a²bc.

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