Question

tính nhanh 

19x82+18x19

Answer 1

\(19\times82+18\times19=19\times\left(82+18\right)=19\times100=1900\)

Answer 2

= 19 x ( 82 + 18)

= 19 x 100 = 1900

Answer 3

`19xx82+18xx19`

`=19xx(82+18)`

`=19xx100`

`=1900`.

Answer 4

19 x (82+18)

=19×100

=1900

Answer 5

19x(82+18) = 19x100 = 1900

Answer 6

 19 x 82 + 18 x 19
= 19 x ( 82 + 18 )
= 19 x 100
= 1900 =)))

Answer 7

19 x 82 + 18 x 19 = (82 + 18) x 19

                             = 100 x 19

                             = 1900.