Question

Answer 1

a) 3/5 + 8/15 =17/15

b) 4/9 - 3/8 = 5/72

Answer 2

a = 17/15

b = 5/72

Answer 3

\(\dfrac{3}{5}\) + \(\dfrac{8}{15}\) =\(\dfrac{17}{15}\)

 

Answer 4

Tham khảo:

a) 3/5 + 8/15 =17/15

b) 4/9 - 3/8 = 5/72

Answer 5

a)=3/5+8/15=17/15(quy đồng)

b)=4/9-21/64=35/306(quy đồng)

Answer 6

3/5 + 2/3 x 4/5

= 3/5 + (2/3 x 4/5)

= 3/5 + 8/15

= 17/15

4/9 - 3/14 : 4/7

= 4/9 - (3/14 : 4/7)

= 4/9 - 3/8

= 5/72