Tính nhanh:
a) (1200 + 60) :12
b) (2100 – 42) : 21
a) (1200 + 60) :12 = 1200 : 12 + 60 : 12 = 100 + 5 = 105
b) (2100 – 42) : 21 = 2100 : 21 – 42 : 21 = 100 – 2 = 98
-- Mod Toán 6