ГДЗ по математике 5 класс Мерзляк Задание 643

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\[1)\ a + b = 14:\]

\[7a + 7b = 7 \cdot (a + b) = 7 \cdot 14 =\]

\[= 98\]

\[2)\ m + n = 1000:\]

\[m \cdot 17 + n \cdot 17 = 17 \cdot (m + n) =\]

\[= 17 \cdot 1000 = 17\ 000\]

\[3)\ k + l = 12:\]

\[k \cdot 9 + 9l = 9 \cdot (k + l) = 9 \cdot 12 =\]

\[= 108\]

\[4)\ c - d = 125:\]

\[4c - 4d = 4 \cdot (c - d) =\]

\[= 4 \cdot 125 = 500\]

\[5)\ x - y = 4:\]

\[x \cdot 23 - 23y = 23 \cdot (x - y) =\]

\[= 23 \cdot 4 = 92\]

\[6)\ p - r = 11:\]

\[56p - r \cdot 56 = 56 \cdot (p - r) =\]

\[= 56 \cdot 11 = 616\]