Question

Va rog urgent pentru clasa a 4 a dau coroana

Answer 1

2/3 = 2 supra 3 ; / = supra ( linie de fractie) 

2/3 + 2/3 = 4/3 
 
2/3 + 5/2 = 4/6 + 15/6 = 19/6  → am adus fractiile la acelasi numitor comun 6

4/5 + 5/4 = ( 4×4)/20 + ( 5×5)/20 = 16/20 + 25/20 = 41/20 
→ amplific prima fractie cu 4, iar a doua fractie cu 5; numitorul comun fiind 20

3/6 + 3/4 = 6/12 + 9/12 = 15/12 = 5/4 

7/8 - 2/3 = 21 /24 - 16/21 = 5/21 

5/4 + 4/5 = 25/20 + 16/20 = 41 /20 

6/7 + 9/21 = 6/7 + 3/7 = 9/7 → am simplificat fractia 9/21 cu 3 = 3/7

5/16 - 1/4 = 5/16 - 4/16 = 1/16 

6/7 + 7/8 = 48/56 + 49/56 = 97/56