Question

tính hợp lí nhất : 35(14-23)-23(14-35)

Answer 1

35( 14 - 23 ) - 23( 14 - 35 )

= 35 . 14 - 35 . 23 - 23 .14 - 23 . 35

= 35 . 14 - 23 . 14

= 12 . 14 

= 168

Answer 2

35(14 - 23) - 23(14 - 35)

= 35 . 14 - 35 . 23 - 23 . 14 - 23 . 35

= 35 . 14 - 23 . 14 - (35 . 23 - 23 . 35)

= 35 . 14 - 23 . 14 - 0

= 35 . 14 - 23 . 14

= 14 . (35 - 23)

= 14 . 12

= 168