Question

tính nhanh a) 5,4 x 1220 + 4,5 x 780 x 3

 

Answer 1

Tính nhanh:

a) 5,4 x 1220 + 4,5 x 780 x 3

= ( 5,4 x 1220 ) + ( 4,5 x 780 ) x 3

= 6588 + 3510 x 3

= 6588 + ( 3510 x 3 )

= 6588 + 10530

= 17118.

Answer 2

`5,4xx1220+4,5xx780xx3`

`=4,5xx1464+4,5xx2340`

`=4,5xx(1464+2340)`

`=4,5xx3804=17118`

Answer 3

= 17118