Question

7/15-0,4=...
0,78-3/8=...​

Answer 1

$1)\frac{7}{15}-0,4=\frac{7}{15}-\frac{2}{5}=\frac{1}{15}\\\\ 2)0,78-\frac{3}{8}=\frac{39}{50}-\frac{3}{8}=\frac{81}{200}=0,405$

Answer 2

Пошаговое объяснение:

$\frac{7}{15} - 0.4 = \frac{7}{15} - \frac{2}{5} = \frac{7}{15} - \frac{6}{15} = \frac{7 - 6}{15} = \frac{1}{15} =$

$0.78 - \frac{3}{8} = \frac{39}{50} - \frac{3}{8} = \frac{156}{200} - \frac{75}{200} = \frac{156 - 75}{200} = \frac{81}{200} = 0.405$