Răspuns:
1.
a. 3/2 + 1/4=6/4 +1/4 = 6+1/4=7/4
b. 5/3 +1/6 = 10/6 + 1/6 =11/6
c. 13/4 -5/8 = 26/8 -5/8 =21/8
d. 17/10 -4/5 =17/10-8/10=9/10
e. 4/3 + 5/4 = 16/12 + 15/16 = 31/16
f. 7/9 + 3/4 = 28/36 +27/36= 55/36
g. 9/2 - 4/3 = 27/6 - 8/6 =19/6
2.
3/4 +5/6 = 9/12 + 10/12=19/12
1/6 + 4/15= 5/30 +8/30= 13/30
13/10 - 5/6= 78/60 - 50/60= 28/60= 16/30 (am simplificat prin 2)=8/15 (si iar a simplificat prin 2
9/4 -5/6 =27/12 - 10/12=17/12
5/9 +1/6= 10/18 +3/18 =13/18
9/8 -5/6= 27/24 - 20/24=7/24
17/12 -3/8= 34/24 - 12/24= 22/24=11/12
Explicație pas cu pas: