Repede,vă rog frumos!

Explicație pas cu pas:
2.a)5/7
b)14/42=7/21=1/3
c)35/15=7/3
d)140/20=14/2=7
e)21/105=1/5
f)24/64=12/32=3/8
3.a)5/8=0,625
b)6/5=1,2
c)4/18=2/9=0,(2)
d)3/2,7=30/27=10/9=1,(1)