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Explicação passo a passo:

[tex]\displaystyle \frac{2}{4} +\frac{3}{5} =\frac{(20\div4)\times2+(20\div5)\times3}{20}=\frac{5\times2+4\times3}{20} =\frac{10+12}{20} =\frac{22}{20} =\\\\\\\frac{22\div2}{20\div10} =\frac{11}{10}[/tex]

mmc(4,5)

4, 5 | 2

2, 5 | 2

1, 5 | 5

1, 1 | 1

mmc(4,5) = 2 . 2 . 5 = 20