Răspuns:
Explicație pas cu pas:
Am nevoie repede va rog pana maine la 9
De la 7/68 b,c,e,f si 10/69 b,c,e,f
7
b) 7/6+9/2+(-4 1/3)=7/6+9/2-13/3=7/6+27/6-26/6=8/6=4/3
c) 5 1/2+(-7/5)+11/10=11/2-7/5+11/10=55/10-14/10+11/10=52/10=26/5
e) 26/15+(-3 1/3)+(-17/5)=26/15-10/3-17/5=26/15-50/15-51/15=-80/15=-16/3
f) imi pare rau dar nu pot sa-l rezolv pentru ca nu se vede partea de la urma.
10
b) 5/9+2 1/2+(-1/6)=5/9+5/2-1/6=10/18+45/18-3/18=52/18=26/9
c) (-17/10)+6/5+2 1/4=-34/20+24/20+45/20=35/20=7/4
e) 15/28+(-1 2/7)+(-3/8)=15/28-9/7-3/8=30/56-72/56-21/56=-63/56=-9/8
f) -1 2/9+(-5/18)+7/24= -11/9-5/18+7/24=-88/72-20/72+21/72= -87/72
