Question

а) 11/25 - к = 7/25
б) d + 2/9 = 1/9 + 7/9​

Answer 1

Пошаговое объяснение:

$\frac{11}{25} - k = \frac{7}{25} \\-k = \frac{7}{25} -\frac{11}{25}\\k = \frac{11}{25}-\frac{7}{25} = \frac{11-7}{25} = \frac{4}{25}\\\\d+\frac{2}{9} = \frac{1}{9} + \frac{7}{9}\\d*9+\frac{2}{9}*9 = \frac{1}{9}*9 + \frac{7}{9}*9 \\9d+2=1+7\\9d=1+7-2\\9d=6\\d=\frac{6}{9} = \frac{2}{3}$