Question

9.Efectuati
(5/8+1/4)×12
(4/15-1/5)×25
3/4-7/12)×9
(7/15+1/5)×3
(3/7-1/21)×14
(1intreg-1/9)×3​

Answer 1

$\left(\frac{5}{8}+\frac{1}{4}\right)\cdot \:12 =\frac{7}{8}\cdot \:12 =\frac{21}{2} =10\frac{1}{2}$

$\left(\frac{4}{15}-\frac{1}{5}\right)\cdot \:25 =\frac{1}{15}\cdot \:25 =\frac{5}{3} =1\frac{2}{3}$

$\left(\frac{3}{4}-\frac{7}{12}\right)\cdot \:9 =\frac{1}{6}\cdot \:9 =\frac{3}{2} =1\frac{1}{2}$

$\left(\frac{7}{15}+\frac{1}{5}\right)\cdot \:3 =\frac{2}{3}\cdot \:3 =2$

$\left(\frac{3}{7}-\frac{1}{21}\right)\cdot \:14 =\frac{8}{21}\cdot \:14 =\frac{16}{3} =5\frac{1}{3}$

$\left(1-\frac{1}{9}\right)\cdot \:3 =\frac{8}{9}\cdot \:3 =\frac{8}{3} =2\frac{2}{3}$

Sper că te-am ajutat!

Succes!