\[\boxed{\text{Страница}\text{\ 43.}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[\boxed{137.}\]
\[x\] | \[260\] | \[3\ 973\] |
---|---|---|
\[a\] | \[1\ 340\] | \[127\] |
\[x + a\] | \[1600\] | \[4100\] |
\[a + x\] | \[1600\] | \[4100\] |
\[\boxed{138.\ }\]
\[При\ любых\ значениях\ \text{x\ }и\ \text{y\ }\]
\[верно\ равенство:\]
\(x + y = y + x\)
\[\boxed{139.}\]
\[a\] | \[30\] | \[105\] | \[440\] | \[6\] | \[60\] |
---|---|---|---|---|---|
\[b\] | \[20\] | \[8\] | \[2\] | \[15\] | \[10\] |
\[a \cdot b\] | \[600\] | \[840\] | \[880\] | \[90\] | \[600\] |
\[b \cdot a\] | \[600\] | \[840\] | \[880\] | \[90\] | \[600\] |
\[\boxed{140.}\]
\[При\ любых\ значениях\ m\ и\ \text{k\ }\]
\[верно\ равенство:\]
\[m \cdot k = k \cdot m.\]
\[\boxed{141.}\]
\[16 \cdot 20 = 20 \cdot 16\]
\[528 + 64 = 64 + 528\]
\[961 + 1008 = 1008 + 961\]
\[2 \cdot 500 = 500 \cdot 2\]