78-65= 13 (yuan)

A: Basketball is more expensive than football 13 yuan.

(2) How much is a badminton racket and a table tennis racket?

36+24=60 (yuan)

A: A badminton racket and a table tennis racket ***60 yuan.

(3) How many times more expensive is a table tennis bat than a box of China chess?

24÷ 12=2

A: A ping-pong bat costs twice as much as a box of China chess.