ГДЗ по математике 5 класс Мерзляк Задание 1127

\[\boxed{\mathbf{1127\ (1127)}.\ Еуроки\ - \ ДЗ\ без\ мороки}\]

\[1)\ x = 35:\]

\[72\ :(x - 17) - 4 =\]

\[= 72\ :(35 - 17) - 4 =\]

\[= 72\ :18 - 4 = 4 - 4 = 0.\]

\[2)\ x = 321:\]

\[(x + 259)\ :(x - 205) =\]

\[= (321 + 259)\ :(321 - 205) =\]

\[= 580\ :116 = 5.\]

\[3)\ a = 3,6;\ \ \ \ \ b = 4,8:\]

\[61,32 - 61,32\ :(a + b) =\]

\[= 61,32 - 61,32\ :(3,6 + 4,8) =\]

\[= 61,32 - 61,32\ :8,4 = 54,02\]

\[4)\ x = 0,82;\ \ y = 0,4:\]

\[4,346\ :x - y\ :0,25 =\]

\[= 4,346\ :0,82 - 0,25 = 3,7\]

\[5)\ x = 3,4;\ \ y = 0,4:\]

\[2,04\ :x + 5,19y =\]

\[= 2,04\ :3,4 + 5,19 \cdot 0,4 = 2,676\]

\[6)\ m = 2,6;\ \ n = 5,09:\]

\[1,4m - 0,3n =\]

\[= 1,4 \cdot 2,6 - 0,3 \cdot 5,09 = 2,113\]

\[7)\ x = 0,2346;\ \ y = 26540:\]

\[1000x + 0,01y =\]

\[= 1000 \cdot 0,2346 + 0,01 \cdot 26540 =\]

\[= 234,6 + 265,4 = 500\]

\[8)\ x = 0,1;\ \ \ y = 100:\]

\[453x - 0,1827y =\]

\[= 453 \cdot 0,1 - 0,1827 \cdot 100 =\]

\[= 45,3 - 18,27 = 27,03\]

\[9)\ x = 9\frac{2}{21};\ \ y = 6\frac{5}{21};\text{\ \ }\]

\[z = 7\frac{13}{21}:\]

\[x + y - z = 9\frac{2}{21} + 6\frac{5}{21} - 7\frac{13}{21} =\]

\[= 8\frac{23}{21} + 6\frac{5}{21} - 7\frac{13}{21} =\]

\[= 7\ \frac{23 + 5 - 13}{21} = 7\frac{15}{21} = 7\frac{5}{7}.\]

\[10)\ a = 10;\ \ b = 3\frac{9}{14};\text{\ \ }\]

\[c = 4\frac{13}{14};\ \ d = 2\frac{8}{14}:\]

\[a - b - c + d =\]

\[= 10 - 3\frac{9}{14} - 4\frac{13}{14} + 2\frac{8}{14} =\]

\[= 8\frac{28}{14} - 3\frac{9}{14} - 4\frac{13}{14} + 2\frac{8}{14} =\]

\[= 3\ \frac{28 - 9 - 13 + 8}{14} = 3\frac{14}{14} = 4.\]