Răspuns:
Explicație pas cu pas:
98=2×7²
49=7²
4=2² numitorul comun=2²×7²=14²=196
3/98×2=6/196
1/49×4=4/196
7/4×49=343/196
b) 33=3×11
55=5×11
15=3×5
11=1×11 numitorul comun 3×5×11=165
2×5/165=10/165
12/55=36/165
4/15=4×11/165=44/165
5/11=5×15/165=75/165
