Question

assunto é MMC 2\7+1\2= 1\5+4\10= 1\4+1\2 1\4+2\3= 2\9+2\3= 2\3-1\4= 5\6-2\3= 5\6-1\2= 2\4-1\2= 3\6+5\8= 3\6+1\2=

Answer 1

2\7+1\2=  mmc = 14
1\5+4\10= mmc = 10
1\4+1\2 = mmc = 4
1\4+2\3= mmc = 12
2\9+2\3= mmc = 9
2\3-1\4= mmc = 12
5\6-2\3= mmc = 6
5\6-1\2= mmc = 6
2\4-1\2= mmc = 4
3\6+5\8= mmc = 24
3\6+1\2= mmc = 6

resolvendo
$\frac{3}{6} + \frac{5}{8}=$

$\centering %centraliza a tabela \begin{tabular}{rr|c|c} & & MMC & MDC \\ %cabecalho 6, & 8 & 2 & 2\\ 3, & 4 & 2\\ 3, & 2 & 2\\ 3, & 1 & 3\\ 1, & 1\\ \end{tabular}\\\left \text{MMC}\,\,\ 2^3 \cdot 3 = 24$

4×3/24 + 3×5/24
12/24+15/24
(12+15)/24
27/24

o restante tu pratica, já mostrei como faz