1. Adding and subtracting algebraic expressions with the whole idea can often get twice the result with half the effort. For example, the algebraic expression 3 (a-b)-8 (a-b)+6 (b-a) can be regarded as a whole. What is the result?

2. Given A-B =-5/6, then 3-(b-A) =? 8-6a+6b=？

3. A train goes from Station A to Station C via the mile mile. The speed of the train is one kilometer per hour, and the distance between Station A and bilibili is100km. If the train starts counting after the departure, how many kilometers is it from Station A after t hours?

2. The principle is the same as the question 1, 3-(b-a) = 3-5/6 = 13/6, 8-6a+6b = 8-6 (a-b) = 13.

3. 100+at

1。 6(b-a)= -6(a-b). If (a-b) is a number such as D, the original formula is 3D-8D-6D=- 1 1D, and then D is replaced by (a-b), and the final answer is-/kloc-.