Sagot :
A= 17/10 + 19/20
A= 17*2 / 10*2 + 19/20
A= 34/20 + 19/20
A= 55/20
A = 11/4
A= 17 + 19
--- ---
10 20
A= 17 x ? + 19
------------ ---
10 x ? 20
A = ?
---
?
A= 17/10 + 19/20
A= 17*2 / 10*2 + 19/20
A= 34/20 + 19/20
A= 55/20
A = 11/4