Question

Tính nhanh: a) 36 + 53 + 47 + 64 b) 242 - 42 + 167 - 67  

Answer 1

36 + 53 + 47 + 64 =

200     242 - 42 + 167 - 67 = 300

Answer 2

a) 36 + 53 + 47 + 64 = (36+64)+(53+47)= 100+100=200

b) =(242-42)+(167-67)= 200+100=300

Answer 3

A)

= ( 36 + 64 ) + ( 53 + 47 )

= 100 + 100

= 200

B)

= ( 242 - 42 ) + ( 167 - 67 )

= 200 + 100

= 300