Задание 123 Вариант 2 Самостоятельная работа ГДЗ Дидактические материалы Чесноков 6 класс (Математика)

а) $$\frac{3}{8}y+\frac{4}{9}y-\frac{5}{12}y=\left(\frac{27}{72}+\frac{32}{72}-\frac{30}{72}\right)y=\frac{29}{72}y.$$

б) $$1\frac{5}{12}m+2\frac{7}{18}m-1\frac{2}{9}m=\left(1\frac{15}{36}+2\frac{14}{36}-1\frac{8}{36}\right)m=\left(3\frac{29}{36}-1\frac{8}{36}\right)m=2\frac{21}{36}m=2\frac{7}{12}m.$$

в) $$\frac{4}{7}a+\frac{5}{21}a-\frac{2}{3}a=\left(\frac{12}{21}+\frac{5}{21}-\frac{14}{21}\right)a=\frac{3}{21}a=\frac{1}{7}a.$$

г) $$2\frac{1}{3}x+3\frac{3}{5}x+\frac{1}{15}x=\left(2\frac{5}{15}+3\frac{9}{15}+\frac{1}{15}\right)x=\left(5\frac{14}{15}+\frac{1}{15}\right)x=6x.$$