Răspuns:
Explicație pas cu pas:
c) +7/18+(-3/2)+(-11/9)+(+4/1)=(7-27-22+72)/18=30/18=10/6=5/3
d) -2/21+(-3/7)+(+5/42)+(-9/14)=(-4-18+5-27)/42=-44/42=-22/21
e) (-7/11)+(-1/4)+(+1/2)+(-5/22)=(-28-11+22-10)/44=-27/44
f) 2/7+(-1/14)+(+5/6)+(-13/42)=(12-3+35-13)/42=31/42
4.
a) (-1/9)+(17/54)+(-11/6)+5/27=(-6+17-99+10)/54=-78/54=-39/27=-13/9
b) (-9/10)+(-7/12)+(+19/30)+(+1/5)=(-54-35+38+12)/60=-39/60=-13/20
c) (-3/8)+(+1/16)+(-1/2)+(-3/4)=(-6+1-8-12)/16=-25/16
d) (+5/4)+(-4/5)+(-5/2)+(+7/10)=(25-16-50+14)/20=-27/20
e) nu se vad numitorii exercitiului
f) -11/18+(-7/108)+(-14/3)+(-5/36)=(-66-7-504-15)/108=-592/108=-148/27
