Question

Câu 4 Tính bằng cách thuận tiện nhất.

2019 + 2019 +2019 + 2019 + 2019 x 7 - 2019

Answer 1

`2019 + 2019 + 2019 + 2019 + 1029 xx 7 - 2019`

`= 2019 xx ( 1 + 1 + 1 + 1 + 7 - 1 )`

`= 2019 xx 10`

`= 20190`

Answer 2

2019 + 2019 +2019 + 2019 + 2019 x 7 - 2019

= 2019 x ( 7 +1 +1+1 - 1 )

= 2019 x 10

= 20190

Answer 3

2019 + 2019 +2019 + 2019 + 2019 x 7 - 2019

= 2019 x 1 + 2019 x 1 + 2019 x 1 + 2019 x 1 + 2019 x 7 - 2019 x 1

= 2019 x ( 1 + 1 + 1 + 1 + 7 - 1 )

= 2019 x 10

= 20190

Answer 4

2019+20192019+2019+2019x7-2019

= 2019x(7+1+1+1-1)

= 2019 x 10

=20190

Answer 5

2019+2019+2019+2019+1029×7−2019

=2019×(1+1+1+1+7−1)

=2019×10

=20190 nha 

Answer 6

20190

Answer 7

2019+2019+2019+2019+1029×7−20192019+2019+2019+2019+1029×7-2019

=2019×(1+1+1+1+7−1)=2019×(1+1+1+1+7-1)

=2019×10=2019×10

=20190