Question

tính nhanh

Answer 1

k, 136.23 + 136.17 - 40.36

= 136.( 23 + 17 ) - 40.36

= 136.40 - 40.36

= 40. ( 136 - 36 )

= 40. 100

= 4000.

l, 17.93 + 116.83 + 17.23

= 17. ( 93 + 23 ) + 116 . 83

= 17. 116 + 116 . 83

= 116 . ( 17 + 83 )

= 116 . 100

= 11600.

m, 19.27 + 47.81 + 19.20

= 19. ( 27 + 20 ) + 47 . 81

= 19. 47 + 47 . 81

= 47 . ( 19 + 81 )

= 47 . 100

= 4700

Answer 2

k) \(136.23+136.17-40.36\)

\(=136.\left(23+17\right)-40.36\)

\(=136.40-40.36\)

\(=40.\left(136-36\right)=40.100=4000\)

l) \(17.93+116.83+17.23\)

\(=17.\left(93+23\right)+116.83\)

\(=17.116+116.83\)

\(=116.\left(17+83\right)=116.100=11600\)

m) \(19.27+47.81+19.20\)

\(=19.\left(27+20\right)+47.81\)

\(=19.47+47.81\)

\(=47.\left(19+81\right)=47.100=4700\)