\[Страница\ 76.\]
\[Формулы\]
\[\boxed{\mathbf{1}.}\]
\[\textbf{а)}\ s = v \cdot t\]
\[\textbf{б)}\ P = 2 \cdot (a + b)\]
\[\textbf{в)}\ P = 4 \cdot a\]
\[\textbf{г)}\ S = a \cdot b\]
\[\textbf{д)}\ S = a \cdot a = a^{2}\]
\[\boxed{\mathbf{2}.}\]
\[s = v \cdot t\] | \[112\ км\] | \[18\ км\] | \[140\ км\] | \[8016\ км\] | \[4800\ м\] | \[1326\ км\] | \[48\ км\] |
---|---|---|---|---|---|---|---|
\[v = s\ :t\] | \[17\ \frac{км}{ч}\] | \[6\ \frac{км}{ч}\] | \[28\ \frac{км}{ч}\] | \[501\ \frac{км}{ч}\] | \[8\ \frac{м}{с}\] | \[102\frac{км}{ч}\] | \[12\ \frac{м}{с}\] |
\[t = s\ :v\] | \[6\ ч\] | \[3\ ч\] | \[5\ ч\] | \[16\ ч\] | \[10\ мин\] | \[13\ ч\] | \[4000\ с\] |
\[10\ мин = 600\ с\]
\[48\ км = 48\ 000\ м\]
\[48\ 000\ :12 = 4000\ с\]
\[\boxed{\mathbf{3}.}\]
\[P = 4a \longrightarrow a = P\ :4\]
\[a\ см\] | \[5\] | \[9\] | \[15\] | \[16\] | \[32\] | \[21\] | \[41\] |
---|---|---|---|---|---|---|---|
\[P\ см\] | \[20\] | \[36\] | \[60\] | \[64\] | \[8\] | \[84\] | \[164\] |
\[\boxed{\mathbf{4}.}\]
\[P = 2 \cdot (a + b)\]
\[\textbf{а)}\ a = 18\ см;\ \ b = 5\ см:\]
\[P = 2 \cdot (18 + 5) = 2 \cdot 23 =\]
\[= 46\ см.\]
\[\textbf{б)}\ a = 14\ см;\ \ b = 3\ дм = 30\ см:\]
\[P = 2 \cdot (14 + 30) = 2 \cdot 44 =\]
\[= 88\ см.\]
\[\textbf{в)}\ a = 7\ дм;\ \ b = 8\ дм:\]
\[P = 2 \cdot (7 + 8) = 2 \cdot 15 = 30\ дм.\]
\[\textbf{г)}\ a = 2\ м\ 3\ см = 203\ см;\ \ \]
\[b = 89\ см:\]
\[P = 2 \cdot (203 + 89) = 2 \cdot 292 =\]
\[= 584\ см.\]