Решебник по математике 3 класс Кремнева рабочая тетрадь Часть 1, 2 Часть 1 | Страница 41

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• \(5 \cdot 5 = 25\)

• \(7 + 6 = 13\)

• \(6 \cdot 2 = 12\)

• \(45\ :9 = 5\)

• \(3 \cdot 9 = 27\)

• \(4 \cdot 5\ :2 = 20\ :2 = 10\)

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\[1)\ 18 + x = 6 \cdot 8\]

\[18 + x = 48\]

\[x = 48 - 18\]

\[x = 30.\]

\[\overline{18 + 30 = 6 \cdot 8}\]

\[48 = 48.\]

\[2)\ 72 - y = 6 \cdot 7\]

\[72 - y = 42\]

\[y = 72 - 42\]

\[y = 30.\]

\[\overline{72 - 30 = 6 \cdot 7}\]

\[42 = 42.\]

\[3)\ 9 \cdot x = 54\]

\[x = 54\ :9\]

\[x = 6.\]

\[\overline{9 \cdot 6 = 54}\]

\[54 = 54.\]

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\[\boxed{5 \cdot 2 = 10} \Longrightarrow \boxed{5 \cdot 3 = 15} \Longrightarrow\]

\[\Longrightarrow \boxed{5 \cdot 4 = 20} \Longrightarrow \boxed{5 \cdot 5 = 25}\]