Question

20,19 x 47 + 2019 x 54 - 2019 x 1

Answer 1

20,19 x 47 + 2019 x 54 - 2019 x 1

=20,19 x (47 + 54 - 1)

=20,19 x 100

=2019

Answer 2

`20,19xx47+2019xx54-2019xx1`

`=2019xx0,47+2019xx54-2019xx1`

`=2019xx(0,47+54-1)`

`=2019xx53,47=107955,93`

Hoặc:

`2019xx47+2019xx54-2019xx1`

`=2019xx(47+54-1)`

`=2019xx100=201900`

Answer 3