Substitute Values: Substitute the given values of a and b into the expression.The expression is ab−0.5b. We are given that a=1 and b=5. Let's substitute these values into the expression.1×5−0.5×5
Perform Multiplication: Perform the multiplication.Now we multiply the numbers.(1×5)−(0.5×5)=5−2.5
Subtract Terms: Subtract the second term from the first term.After multiplication, we subtract 2.5 from 5.5−2.5=2.5
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