(1\frac{ 4}{5} - 3 \frac{2}{7})* 5 \frac{5}{13}=
\frac{4}{5}=
źródło:
(1\frac{4}{5}-3\frac{2}{7})*5\frac{5}{13}=
=(\frac{9}{5}-\frac{23}{7})*\frac{70}{13}=
=(\frac{63}{35}-\frac{115}{35})*\frac{70}{13}=(-\frac{52}{35})*\frac{70}{13}=
=-\frac{52*2}{13}=-\frac{4*2}{1}=-8
(1\frac{4}{5} - 3 \frac{2}{7})* 5\frac{5}{13}=(\frac{9}{5}-\frac{23}{7})*\frac{70}{13}=(\frac{63}{35}-\frac{115}{35})*\frac{70}{13}=(-\frac{52}{35})*\frac{70}{13}=-8
Rozwiązanie innym sposobem
=(1\frac{28}{35}-3\frac{10}{35})*5\frac{5}{13}=
=(1\frac{28}{35}-2\frac{45}{35})*\frac{70}{13}=
=(-1\frac{17}{35})*\frac{70}{13}=-\frac{52*70}{35*13}=-\frac{52*2}{13}=-\frac{4*2}{1}=-8