Resposta :
mdc (84/72) = 12
84/12 = 7
72/12 = 6
7/6
mdc (54/90) = 18
54/18 = 3
90/18 = 5
3/5
mdc (98/28) = 14
98/14 = 7
28/14 = 2
7/2
mdc (147/189) = 21
147/21 = 7
189/21= 9
7/9
Simplifique essas frações pelo método do MDC.
84/72 - 54/90 - 98/28 - 147/189
mdc (84/72) = 12
84/12 = 7
72/12 = 6
7/6
mdc (54/90) = 18
54/18 = 3
90/18 = 5
3/5
mdc (98/28) = 14
98/14 = 7
28/14 = 2
7/2
mdc (147/189) = 21
147/21 = 7
189/21= 9
7/9