Question

tính nhanh

36x17+12x34+6x30

Answer 1

`36xx17+12xx34+6xx30`

`=12xx3xx17+12xx34+6xx2xx15`

`=12xx51+12xx34+12xx15`

`=12xx(51+34+15)`

`=12xx100`

`=1200`

Answer 2

36 x 17 + 12 x 34 + 6 x 30

= 3 x 12 x 17 + 12 x 34 + 6 x 2 x 15

= ( 3 x 17 ) x 12 + 12 x 34 + ( 6 x 2 ) x 15

= 51 x 12 + 12 x 34 + 12 x 15

= 12 x ( 51 + 34 + 15 )

= 12 x 100

= 1200