ГДЗ по математике 5 класс Мерзляк ФГОС Задание 1078

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\[1)\frac{1^{\backslash 6}}{2}a + \frac{1^{\backslash 4}}{3}a - \frac{1^{\backslash 3}}{4}a =\]

\[= \frac{6 + 4 - 3}{12}a = \frac{7}{12}a\]

\[a = 1\frac{5}{7} = \frac{12}{7}:\]

\[\frac{7}{12}a = \frac{7 \cdot 12}{12 \cdot 7} = 1.\]

\[2)\ \frac{4^{\backslash 3}}{7}b + \frac{5}{21}b - \frac{2^{\backslash 7}}{3}b =\]

\[= \frac{12 + 5 - 14}{21}b = \frac{3}{21}b = \frac{1}{7}b\]

\[b = 2\frac{1}{3} = \frac{7}{3}:\]

\[\frac{1}{7}b = \frac{1 \cdot 7}{7 \cdot 3} = \frac{1}{3}.\]