Number Substitution( Week 42 Practice) 1. If a∎b = ab − a + b, which of the following has the smallest value? 2. If a⊥b=(a+b)+(a-b), then what is the value of 14⊥8? 3. If a@b means , then what will 12@(23@25) = ? 4. If a@b=(a × b) − (a + b), how much larger is 10@10 than 5@8? 5. If Δ represents the last digit of the corresponding numbers in the following equation: + = 1, what is the digit Δ? |