Страница 13, ГДЗ по математике за 1 класс к тренажёру Погореловой
Вычисления вида □ + 1, □ − 1, □ + 2, □ − 2
\[{\def\arraystretch{1.6}\begin{array}{ccccccccc} 1 & \boxed{\kern0.035em\textcolor{#e03131}{\mathbf{2}}\kern0.035em} & \boxed{\kern0.035em\textcolor{#e03131}{\mathbf{3}}\kern0.035em} & 4 & 5 & \boxed{\kern0.035em\textcolor{#e03131}{\mathbf{6}}\kern0.035em} & \boxed{\kern0.035em\textcolor{#e03131}{\mathbf{7}}\kern0.035em} & \boxed{\kern0.035em\textcolor{#e03131}{\mathbf{8}}\kern0.035em} & 9 \\ 9 & \boxed{\kern0.035em\textcolor{#e03131}{\mathbf{7}}\kern0.035em} & \boxed{\kern0.035em\textcolor{#e03131}{\mathbf{5}}\kern0.035em} & 3 & 1 \\ 2 & \boxed{\kern0.035em\textcolor{#e03131}{\mathbf{4}}\kern0.035em} & 6 & \boxed{\kern0.035em\textcolor{#e03131}{\mathbf{8}}\kern0.035em} & 10 \end{array}}\]
\[\begin{aligned} 6 + 2 - 1 &= \textcolor{#e03131}{\mathbf{7}} & \qquad 8 - 2 - 2 &= \textcolor{#e03131}{\mathbf{4}} \\ 5 - 1 + 2 &= \textcolor{#e03131}{\mathbf{6}} & \qquad 9 - 1 - 2 &= \textcolor{#e03131}{\mathbf{6}} \\ 6 - 1 - 2 &= \textcolor{#e03131}{\mathbf{3}} & \qquad 2 + 2 - 1 &= \textcolor{#e03131}{\mathbf{3}} \end{aligned}\]
\[\begin{aligned} 3 \overset{\mathclap{\textcolor{#808080}{\scriptstyle 1}}}{-} 2 &\mathrel{\hspace{0.72em}\mathclap{\vcenter{\Large\bigcirc}}\mathclap{\textcolor{#e03131}{\pmb{\boldsymbol{=}}}}\hspace{0.72em}} 2 \overset{\mathclap{\textcolor{#808080}{\scriptstyle 1}}}{-} 1 & \qquad 5 \overset{\mathclap{\textcolor{#808080}{\scriptstyle 7}}}{+} 2 &\mathrel{\hspace{0.72em}\mathclap{\vcenter{\Large\bigcirc}}\mathclap{\textcolor{#e03131}{\pmb{\boldsymbol{=}}}}\hspace{0.72em}} 8 \overset{\mathclap{\textcolor{#808080}{\scriptstyle 7}}}{-} 1 \\ 5 \overset{\mathclap{\textcolor{#808080}{\scriptstyle 6}}}{+} 1 &\mathrel{\hspace{0.72em}\mathclap{\vcenter{\Large\bigcirc}}\mathclap{\textcolor{#e03131}{\pmb{\boldsymbol{>}}}}\hspace{0.72em}} 7 \overset{\mathclap{\textcolor{#808080}{\scriptstyle 5}}}{-} 2 & \qquad 7 \overset{\mathclap{\textcolor{#808080}{\scriptstyle 9}}}{+} 2 &\mathrel{\hspace{0.72em}\mathclap{\vcenter{\Large\bigcirc}}\mathclap{\textcolor{#e03131}{\pmb{\boldsymbol{>}}}}\hspace{0.72em}} 9 \overset{\mathclap{\textcolor{#808080}{\scriptstyle 8}}}{-} 1 \\ 6 \overset{\mathclap{\textcolor{#808080}{\scriptstyle 8}}}{+} 2 &\mathrel{\hspace{0.72em}\mathclap{\vcenter{\Large\bigcirc}}\mathclap{\textcolor{#e03131}{\pmb{\boldsymbol{>}}}}\hspace{0.72em}} 7 \overset{\mathclap{\textcolor{#808080}{\scriptstyle 6}}}{-} 1 & \qquad 5 \overset{\mathclap{\textcolor{#808080}{\scriptstyle 4}}}{-} 1 &\mathrel{\hspace{0.72em}\mathclap{\vcenter{\Large\bigcirc}}\mathclap{\textcolor{#e03131}{\pmb{\boldsymbol{<}}}}\hspace{0.72em}} 3 \overset{\mathclap{\textcolor{#808080}{\scriptstyle 5}}}{+} 2 \\ 4 \overset{\mathclap{\textcolor{#808080}{\scriptstyle 5}}}{+} 1 &\mathrel{\hspace{0.72em}\mathclap{\vcenter{\Large\bigcirc}}\mathclap{\textcolor{#e03131}{\pmb{\boldsymbol{>}}}}\hspace{0.72em}} 5 \overset{\mathclap{\textcolor{#808080}{\scriptstyle 4}}}{-} 1 & \qquad 9 \overset{\mathclap{\textcolor{#808080}{\scriptstyle 7}}}{-} 2 &\mathrel{\hspace{0.72em}\mathclap{\vcenter{\Large\bigcirc}}\mathclap{\textcolor{#e03131}{\pmb{\boldsymbol{=}}}}\hspace{0.72em}} 6 \overset{\mathclap{\textcolor{#808080}{\scriptstyle 7}}}{+} 1 \end{aligned}\]
