5/12+5/12*4 5/12+5/12*6 5/7+1/2*2 *4/5 5/12*5/12*5/12

5/12 + 5/12 x 4

= 5/12 + 20/12

= (5 + 20) / 12

= 25/12

Vậy 5/12 + 5/12 x 4 = 25/12

5/12 + 5/12 x 6

= 5/12 + 30/12

= (5 + 30) / 12

= 35/12

Vậy 5/12 + 5/12 x 6 = 35/12

5/7 + 1/2 x 2 x 4/5

= 5/7 + 2/2 x 4/5

= 5/7 + 1 x 4/5

= 5/7 + 4/5

= 25/35 + 28/35

= (25 + 28) / 35

= 53/35

Vậy 5/7 + 1/2 x 2 x 4/5 = 53/35

5/12 x 5/12 x 5/12

= 25/144 x 5/12

= 125/1728

Vậy 5/12 x 5/12 x 5/12 = 125/1728