giải giúp em bài này em cho 5vote

`a) 739 xx 2 + 739 + 739 xx 3 + 739 xx 4`

`= 739 xx (2 + 1 + 3 + 4)`

`= 739 xx 10`

`= 7390`

` `

`b) 801 xx 67 + 34 xx 801 - 801`

`= 801 xx (67 + 34 - 1)`

`= 801 xx 100`

`= 80100`

` `

`c) 7/15 + 8/15 + 9/16 + 7/16`

`= (7/15 + 8/15) + (9/16 + 7/16)`

`= 15/15 + 16/16`

`= 1 + 1`

`= 2`

a) 739 x 2 + 739 + 739 x 3 + 739 x 4

= 739 x ( 2 + 1 + 3 + 4 )

= 739 x 10

= 7390

b) 801 x 67 + 34 x 801 - 801

= 801 x ( 67 + 34 - 1 )

= 801 x 100

= 80100

c) $\frac{7}{15}$ + $\frac{8}{15}$ + $\frac{9}{16}$ + $\frac{7}{16}$

= ( $\frac{7}{15}$ + $\frac{8}{15}$ ) + ( $\frac{9}{16}$ + $\frac{7}{16}$ )

= $\frac{15}{15}$ + $\frac{16}{16}$ 

= 1 + 1 

= 2