A) 4130 + 4130 + 4130 + 319 + 319 + 319B) 1052 + 1052 – ( 286 + 286 + 286 )C) 2020 + 2020 + 2010 +2010 +56 +56D) 2830 + 2830 + 2830 + 2830 +2830

Câu 1: Tính nhanh:

a) 4130 + 4130 + 4130 + 319 + 319 + 319

b) 1052 + 1052 – ( 286 + 286 + 286 )

c) 2020 + 2020 + 2010 +2010 +56 +56

d) 2830 + 2830 + 2830 + 2830 +2830