Question

треба тільки 1 та 4 будь ласка​

Answer 1

1) $7\frac{7}{9}- 4\frac{1}{12} + 2\frac{3}{4}=\frac{70}{9} - \frac{49}{12} +\frac{11}{4} = \frac{280-147+99}{36}=\frac{232}{36}=\frac{58}{9}=6\frac{4}{9}$

4)$(20-7\frac{23}{36} )-(14\frac{4}{27} -6\frac{1}{18} ) =(20-\frac{275}{36} )-(\frac{382}{27} -\frac{109}{18} ) = \frac{445}{36} - \frac{437}{54} = \frac{461}{108} =4\frac{29}{108}$