Решебник по математике 5 класс Мерзляк ФГОС Задание 1131

 

\[\boxed{\mathbf{1131\ (1131)}.\ Еуроки\ - \ ДЗ\ без\ мороки}\]

\[1)\ 2,6 \cdot 2,8 \Longrightarrow 7,28 + 1,72 \Longrightarrow\]

\[\Longrightarrow 9\ :60 \Longrightarrow 0,15\]

\[x = 7,28\ :2,8 = 72,8\ :28 = 2,6\]

\[y = 9 - 7,28 = 1,72\]

\[z = 9\ :0,15 = 900\ :15 = 60.\]

\[2)\ 3,01\ :1,4 \Longrightarrow 2,15 - 0,35 \Longrightarrow\]

\[\Longrightarrow 1,8 \cdot 0,03 \Longrightarrow 0,054\]

\[a = 2,15 \cdot 1,4 = 3,01\]

\[b = 2,15 - 1,8 = 0,35\]

\[c = 0,054\ :0,03 = 5,4\ :3 = 1,8.\]

\[3)\ 1,2 + 0,42 \Longrightarrow 1,62\ :0,3 \Longrightarrow\]

\[\Longrightarrow 5,4\]

\[1,2 \cdot 4,5 \Longrightarrow 5,4\]

\[x = 1,62 - 1,2 = 0,42\]

\[y = 5,4 \cdot 0,3 = 1,62\]

\[z = 1,2 \cdot 4,5 = 5,4.\]

\[4)\ 6,4\ :20 \Longrightarrow 0,32 \cdot 125 \Longrightarrow 40\]

\[6,4\ :0,16 \Longrightarrow 40\]

\[a = 40 \cdot 0,16 = 6,4\]

\[b = 6,4\ :0,32 = 640\ :32 = 20\]

\[c = 40\ :0,32 = 4000\ :32 =\]

\[= 125.\]

\[\boxed{\mathbf{1131}\mathbf{.}\mathbf{\ }}\]

\[1)\ \frac{7}{11} \Longrightarrow \frac{11}{7}\]

\[2)\ 6 \Longrightarrow \frac{1}{6}\]

\[3)\ 2\frac{2}{5} = \frac{12}{5} \Longrightarrow \frac{5}{12}\]

\[4)\ \frac{1}{9} \Longrightarrow 9\]