\[\mathbf{Страница\ 13.}\]
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\[Выучите\ наизусть\ таблицу.\]
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\[\textbf{а)}\]
\[\textbf{б)}\ \]
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\[Слагаемое\] | \[1052\] | \[5\] | \[12\ 349\] | \[280\] | \[500\] |
---|---|---|---|---|---|
\[Слагаемое\] | \[24\] | \[234\] | \[0\] | \[222\] | \[18\] |
\[Сумма\] | \[1076\] | \[239\] | \[12\ 349\] | \[502\] | \[518\] |
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\[(300 + 85) + 15 =\]
\[= 300 + (85 + 15) =\]
\[= 300 + 100 = 400\]
\[328 + (50 + 522) =\]
\[= (328 + 522) + 50 =\]
\[= 850 + 50 = 900\]
\[348 + 222 + 52 + 78 =\]
\[= (348 + 52) + (222 + 78) =\]
\[= 400 + 300 = 700\]