Question

Допоможіть будь ласка СРОЧНО дуже

Answer 1

Надеюсь понятно ……..

Answer 2

Покрокове пояснення:

1)

$\displaystyle\\16\frac{1}{4} +14\frac{1}{12} =(16+\frac{1}{4})+(14+\frac{1}{12})=(16+14)+(\frac{1}{4} +\frac{1}{12})= 30+\frac{1*3+1*1}{12}=\\\\\\=30+\frac{3+1}{12}=30+\frac{4}{12} =30+\frac{1}{3}=30\frac{1}{3} .$

2)

$\displaystyle\\21\frac{1}{2} -9\frac{1}{3}=(21-9)+( \frac{1}{2}-\frac{1}{3} )=12+\frac{1*3-1*2}{2*3} =12+\frac{3-2}{6} =12+\frac{1}{6}=12\frac{1}{6} .$

3)

$\displaystyle\\9\frac{2}{7} *7=(9+\frac{2}{7} )*7=9*7+\frac{2}{7}*7 =63+2=65.$

4)

$\displaystyle\\5\frac{1}{9}:7\frac{2}{3}=\frac{5*9+1}{9}:\frac{7*3+2}{3}=\frac{45+1}{9}:\frac{21+2}{3}=\frac{46}{9}:\frac{23}{3}=\frac{46}{9} *\frac{3}{23} =\\\\\\ =\frac{46*3}{9*23} =\frac{2}{3}.$