Question

Inca ceva......
Calculează simplificand mai intai fractiile
28/32-15/ 40
14/49-5/45
18/20-9/30
AJUTOR

Answer 1

28/32-15/40=7/8-3/8=4/8=1/2

14/49-5/45=2/7-1/9=18/63-7/63=11/63

18/20-9/30=9/10-3/10=6/10=3/5

Answer 2

28 / 32 - 15/40 =
28/32= simplific cu 4= 7/8
 15/40= simplific cu 5 = 3/8
7/8 - 3/8  = (7-3)/8= 4/8 simplific cu 4= 1/2

14/49 - 5/45 =
14/49= simplific cu 7 = 2 /7
5/45 =simplific cu 5= 1/9
2/7 - 1/9= 
aducem la acelasi numitor, numitorul comun este 63, amplific prima fractie cu 9 si a doua cu 7
18/63 - 7/63=  11/63

18/20 - 9/30 =
18/20 = simplific cu 2= 9/10
9/30= simplific cu 3= 3/10
9/10 - 3/10 = 6/10 simplific cu 2 = 3/5