Tính nhanh: a) (525 + 315) :15 b) (2400 +72) : 24 c) (1026 – 741) : 57 d) (3600 – 108) : 36

Tính nhanh:

a) (525 + 315) :15

b) (2400 +72) : 24

c) (1026 – 741) : 57

d) (3600 – 108) : 36

Hướng dẫn

a) (525 + 315) :15 = 525:15 + 315 :15 = 35 + 21 = 56

b) (2400 +72) : 24 = 2400:24 +72 : 24 = 100 + 3 = 103

c) (1026 – 741) : 57 = 1026:57 – 741 : 57 = 18 – 13 = 5

d) (3600 – 108) : 36 = 3600: 36 – 108 : 36 = 100 – 3 = 97