Question

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Answer 1

$frac{1}{20} +frac{2}{9} =frac{9}{180} +frac{40}{180} =frac{49}{180}$

Answer 2

спасибо

Answer 3

:3

Answer 4

:З

Answer 5

НОЗ(20, 9) = 180
$frac{1}{20} + frac{2}{9} = frac{9}{180} + frac{40}{180} = frac{9 + 40}{180} = frac{49}{180}$