bánh xe lăn được 200 vòng

mình hihi

“What did the meeting discuss? I didn’t attend it because of traffic jam.” - “ ____”

A. I didn’t, either

B. That was great

C. You missed the meeting

D. I’m sorry, I can’t

Bài 3 : a) 3784 + 23 - 3785 - 15

= (3784 - 3785) + (23 - 15)

= -1 + 8 

= 7

b) 21 + 22 + 23 + 24 - 11 - 12 - 13 - 14

= (21 - 11) + (22 - 12) + (23 - 13) + (24 - 14)

= 10 + 10 + 10 + 10 

= 40

Bài 4 : a) -2001 + (1999 + 2001)

= -2001 + 1999 + 2001

= ( - 2001 + 2001 ) + 1999

= 0 + 1999

= 1999

B) (43 - 863) - (137 - 57)

= 43 - 863 - 137 - 57 

= (43 - 57) + ( -863 - 137 )

= -14 + -1000

= -1014 

Nhớ tick !!!