Question

ma puteti ajuta la exercitile 8 si 9

Answer 1

la a)5/6+2/3-amplificam a doua cu 2 si obtinem 5/6+4/6=10/6
la b)1/4+2/3-amplificam prima cu 3 si a doua cu 4si obtinem 3/12+8/12=11/12
la c)5/9+2/3-amplificam prima cu 3 si a doua cu 9 si obtinem 13/27+18/27=31/27 
la d)1/21+2/3-amplificam a doua cu 7 si obtinem 1/21+14/21=15/21
la e)5/27+2/3-amplificam a doua cu 9 si obtinem 5/27+18/27=22/27
la f)5/81+2/3-amplificam a doua cu 27 si obtinem 5/81+54/81=59/81

Answer 2

8 
a)
5/6+2/3=  5/6+4/6=9/6
1/4+2/3= 3/12+8/12= 11/12
5/9 + 2/3= 5/9+6/9=11/9
1/21+2/3= 1/21+ 14/21= 15/21
5/27+2/3= 5/27+18/27= 23/27
5/81+2/3= 5/81+54/81 = 59/81

9
2/4+5/10+3/6= 1/2+1/2+1/2=3/2
9/30+28/20+20/40= 3/10+14/10+5/10= 22/10
4/8+9/24+15/36= 4/8+9/24+5/12= 12/24+9/24+10/24= 31/24
1/3+20/30+44/33+95/57= 1/3+2/3+4/3+5/3= 12/3=4
7/33+16/44= 7/33+4/11= 7/33+12/33=19/33