Question

17/21*3/5+17/21*2/5

Answer 1

= 17/21 * (3/5 + 2/5)

= 17/21 * 5/5

= 17/21 * 1

= 17/21

Học tốt nha!

Answer 2

=17/21 x 3/5 + 17/ 21 x 2/5

= 17/ 21 x ( 3/5 + 2/5 )
=  17/ 21x     1

= 17/21

Hok tốt !!!