Question

Tính bằng cách thuận tiện: 19 x 9 + 9 x ( 37+43) + 9

Answer 1

19.9+9.(37+43)+9

=19.9+9.80+9

=9.(19+80+1)

=9.100

=900

Answer 2

`#Ya`

`= 19 × 9 + 9 × 80 + 9 × 1`

`= 9 × ( 19 + 80 + 1 )`

`= 9 × 100= 900`

Answer 3

`19xx9+9xx(37+43)+9`

`=9xx(19+37+43+1)`

`=9xx100=900`

Answer 4

=9.[9+(37+43)+1]

=9.[9+80+1]

=9.100

=900