\[Страница\ 91.\]
\[\boxed{\mathbf{2}.}\]
\[a\] | \[3\ м\] | \[4\ см\] | \[20\ см\] | \[12\ дм\] | \[16\ см\] | \[3\ дм\] |
---|---|---|---|---|---|---|
\[b\] | \[10\ м\] | \[400\ см\] | \[35\ см\] | \[10\ дм\] | \[160\ мм\] |
\[50\ см =\] \[= 5\ дм\] |
\[c\] | \[5\ м\] | \[200\ см\] | \[200\ мм\] | \[50\ см = 5\ дм\] | \[2\ м\] | \[1\ дм\] |
\[V = abc\] | \[150\ м\] | \[32\ м^{2}\] | \[14\ 000\ см^{3}\] | \[600\ дм^{3}\] | \[5120\ см^{3}\] | \[15\ дм³\] |
\[32\ м^{2} = 320\ 000\ см^{2}\]
\[200\ мм = 20\ см\]
\[20 \cdot 35 \cdot 20 = 700 \cdot 20 =\]
\[= 14000\ см^{3}\ \]
\[160\ мм = 16\ см;2\ м = 200\ см:\]
\[16 \cdot 16 \cdot 20 = 256 \cdot 20 =\]
\[= 5120\ см^{3}\]
\[\boxed{\mathbf{3}.}\]
\[V = a^{3}\]
\[\textbf{а)}\ 4^{3} = 64\ см^{3};\]
\[\textbf{б)}\ 5^{3} = 125\ см^{3};\]
\[\textbf{в)}\ 6^{3} = 216\ см^{3};\]
\[\textbf{г)}\ 8^{3} = 512\ см^{3}.\]
\[\boxed{\mathbf{4}.}\]
\[1)\ 2 \cdot 3 = 6\ (см) - ширина.\]
\[2)\ 2 \cdot 5 = 10\ (см) - длина.\]
\[3)\ V = 2 \cdot 6 \cdot 10 = 120\ см^{3}.\]
\[Ответ:120\ см^{3}.\]
\[\boxed{\mathbf{5}.}\]
\[\textbf{а)}\ увеличится\ в\ 15\ раз.\]
\[\textbf{б)}\ уменьшится\ в\ 24\ раза;\]
\[\textbf{в)}\ увеличится\ в\ 10\ раз;\]
\[\textbf{г)}\ уменьшится\ в\ 2\ раза.\]