Răspuns:
3/8=6/16
3·16=8·6
48=48 (adevarat)
________
3/8=9/64
3·64=8·9
192≠72 ( fals)
____________
3a/8a=3/8
3a·8=3·8a
24a=24a (adevarat)
sau simplifici a cu a
12b/32b=3/8
12b·8=32b·3
96b=96b (adevarat)
___________
(3+c)/8c=3/8
8(3+c)=3·8c
24+8c=24c
24=24c-8c=>c=24/16=>c=3/2 (fals)
