Страница 38, ГДЗ по математике за 1 класс к тренажёру Погореловой
Сложение вида □ + 7, □ + 8, □ + 9
\[\begin{aligned} 1 + 9 &= \textcolor{#e03131}{\mathbf{10}} & \qquad 2 + 3 + 5 &= \textcolor{#e03131}{\mathbf{10}} \\ 2 + 8 &= \textcolor{#e03131}{\mathbf{10}} & \qquad 1 + 7 + 2 &= \textcolor{#e03131}{\mathbf{10}} \\ 3 + 7 &= \textcolor{#e03131}{\mathbf{10}} & \qquad 2 + 4 + 3 &= \textcolor{#e03131}{\mathbf{9}} \\ 1 + 8 &= \textcolor{#e03131}{\mathbf{9}} & \qquad 1 + 5 + 4 &= \textcolor{#e03131}{\mathbf{10}} \\ 2 + 7 &= \textcolor{#e03131}{\mathbf{9}} & \qquad 3 + 2 + 5 &= \textcolor{#e03131}{\mathbf{10}} \end{aligned}\]
\[\begin{aligned} \boxed{\kern0.035em\textcolor{#e03131}{\mathbf{2}}\kern0.035em} + 8 &= 10 & \qquad \boxed{\kern0.035em\textcolor{#e03131}{\mathbf{1}}\kern0.035em} + 1 + 8 &= 10 \\ \boxed{\kern0.035em\textcolor{#e03131}{\mathbf{1}}\kern0.035em} + 7 &= 8 & \qquad \boxed{\kern0.035em\textcolor{#e03131}{\mathbf{1}}\kern0.035em} + 5 + 2 &= 8 \\ \boxed{\kern0.035em\textcolor{#e03131}{\mathbf{2}}\kern0.035em} + 7 &= 9 & \qquad \boxed{\kern0.035em\textcolor{#e03131}{\mathbf{1}}\kern0.035em} + 2 + 6 &= 9 \\ \boxed{\kern0.035em\textcolor{#e03131}{\mathbf{1}}\kern0.035em} + 9 &= 10 & \qquad \boxed{\kern0.035em\textcolor{#e03131}{\mathbf{1}}\kern0.035em} + 3 + 4 &= 8 \\ \boxed{\kern0.035em\textcolor{#e03131}{\mathbf{1}}\kern0.035em} + 8 &= 9 & \qquad \boxed{\kern0.035em\textcolor{#e03131}{\mathbf{1}}\kern0.035em} + 6 + 3 &= 10 \end{aligned}\]
