1+1-1=

36. Mai usually listens to K-pop music in her free time

37. When I was a child, I enjoyed playing computer games

38. My father spends most of his spare time looking after the garden

39. My friends prefer to play sports rather than surf the Net

khó quá đi

30x30x21:2+1-5:5=bao nhiêu và có dư hay không ?????

wow