Question

Help please to solve it

Answer 1

Ответ:

$x = 1 \frac{13}{25}$

Объяснение:

$3 \frac{4}{5} \div x = 2 \frac{1}{2} \\ x = 3 \frac{4}{5} \div 2 \frac{1}{2}$

$3 \frac{4}{5} \div 2 \frac{1}{2} = \frac{3 \times 5 + 4}{5} \div \frac{2 \times 2 + 1}{2} = \frac{19}{5} \div \frac{5}{2} = \frac{19}{5} \times \frac{2}{5} = \frac{38}{25} = 1 \frac{13}{25}$

$x = 1 \frac{13}{25}$

Answer 2

$\displaystyle\bf\\c)\\\\4\frac{1}{3} \cdot\boxed{}=26\\\\\\\boxed{}=26:4\frac{1}{3}=26:\frac{13}{3} =26\cdot\frac{3}{13} =6\\\\\\Otvet:4\frac{1}{3} \cdot\boxed{6}=26\\\\\\f)\\\\3\frac{4}{5} :\boxed{}=2\frac{1}{2} \\\\\\\boxed{}=3\frac{4}{5} :2\frac{1}{2} =\frac{19}{5} :\frac{5}{2} =\frac{19}{5} \cdot\frac{2}{5} =\frac{38}{25} =1\frac{13}{25} \\\\\\Otvet:3\frac{4}{5} :\boxed{1\frac{13}{25} }=2\frac{1}{2}$