ГДЗ по математике 2 класс Моро ФГОС рабочая тетрадь Часть 1, 2 Часть 1 | Страница 55

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\[\boxed{\mathbf{80.}}\]

\[1)\ 34 + 7 = 34 + 6 + 1 =\]

\[= 40 + 1 = 41\]

\[23 + 9 = 23 + 7 + 2 =\]

\[= 30 + 2 = 32\]

\[2)\ 13 + 8 = 21\]

\[37 + 5 = 42\]

\[56 + 7 = 63\]

\[48 + 4 = 52\]

\[73 + 8 = 81\]

\[65 + 9 = 74\]

\[26 + 4 = 30\]

\[32 + 8 = 40\]

\[51 + 9 = 60\]

\[\boxed{\mathbf{81.}}\]

\[6 + 5 = 11 - 7 = 4 + 10 =\]

\[= 14 - 8 = 6 + 9 = 15\]

\[\boxed{\mathbf{82.}}\]

\[9 - 6 + 3 = 6\]

\[9 + 6 + 3 = 18\]

\[9 - 6 - 3 = 0\]

\[9 + 6 - 3 = 12\]

\[60 - 20 + 10 = 50\]

\[60 - 20 - 10 = 30\]

\[60 + 20 + 10 = 90\]

\[60 + 20 - 10 = 70\]