Question

Answer 1

` 14 xx 230 + 7 xx 540`

` = 2 xx 7 xx 230 + 7 xx 540`

` = 7 xx ( 230 xx 2) + 7 xx 540`

` =7 xx 460 + 7 xx 540`

` = 7 xx ( 460 + 540)`

` = 7 xx 1000`

` = 7000`

Answer 2

= 7 x ( 2x 230 + 540 ) = 7 x 1000 = 7000

Answer 3

14x230+7x540

=7x(2x230)+7x540

= 7 x 460 + 7x540

= 7x(460+540)

= 7x1000

= 7000

Answer 4

14 x 230 + 7 x 540 

=  7 x 2 x 230 + 7 x 540

= 7 x 460 + 7 x 540

= 7 x ( 460 + 540)

= 7x 1000 = 7000

Answer 5

=2×7×230+7×540

=7×(230×2)+7×540

=7×460+7×540

=7×1000=7000

Answer 6

Đề bài: 14 × 230 + 7 × 540

Answer 7

`14xx230+7xx540`

`=14xx230+7xx2xx270`

`=14xx230+14xx270`

`=14xx(230+270)`

`=14xx500`

`=6000`