C.7-1
1.
-11 - 15 = - 11 + (-15) = -26 ***
-27 + 9 = -18 +++
8 - 14 = 8 + (-14) = -6 ^^^
-11 + 15 = 4
9 - 27 = 9 + (-27) = -18 +++
-15 - 11 = -15 + (-11) = -26 ***
-14 + 8 = -6 ^^^
27 - 9 = 27 + (-9) = 18
Равные выражения обозначены одинаковыми знаками справа.
2.
9,8 + 7,1 - 9,8 = (9,8 - 9,8) + 7,1 = 0 + 7,1 = 7,1
-35 + 21 + 4 = -35 + (21+4) = -35 + 25 = -10
68 - 42 - 26 = 68 - (42 + 26) = 68 - 68 = 0
72,9 - 44,3 - 72,9 = (72,9 - 72,9) - 44,3 = 0 - 44,3 = -44,3
С.6-4
1.
-3,25 + (-4,15) + 6 = -(3,25 + 4,15) + 6 = -7,4 + 6 = -1,4
33 + (-17,9) - 28,1 = 33 - (17,9 + 28,1) = 33 - 46 = -13
-21,4 + 80 + (-58,6) = 80 - (21,4 + 58,6) = 80 - 80 = 0
-19 - (+6,32) + 4,68 = 4,68 - (19 + 6,32) = 4,68 - 25,32 = -20,64
2.
![\frac{3}{4}+\frac{1}{6}=\frac{9}{12}+\frac{2}{12}=\frac{9+2}{12}=\frac{11}{12}](https://tex.z-dn.net/?f=+%5Cfrac%7B3%7D%7B4%7D%2B%5Cfrac%7B1%7D%7B6%7D%3D%5Cfrac%7B9%7D%7B12%7D%2B%5Cfrac%7B2%7D%7B12%7D%3D%5Cfrac%7B9%2B2%7D%7B12%7D%3D%5Cfrac%7B11%7D%7B12%7D+)
![-\frac{8}{15}-\frac{2}{3}=-\frac{8}{15}-\frac{10}{15}=-\frac{8+10}{15}=-\frac{18}{15}=-\frac{6}{5}=-1\frac{1}{5}](https://tex.z-dn.net/?f=-%5Cfrac%7B8%7D%7B15%7D-%5Cfrac%7B2%7D%7B3%7D%3D-%5Cfrac%7B8%7D%7B15%7D-%5Cfrac%7B10%7D%7B15%7D%3D-%5Cfrac%7B8%2B10%7D%7B15%7D%3D-%5Cfrac%7B18%7D%7B15%7D%3D-%5Cfrac%7B6%7D%7B5%7D%3D-1%5Cfrac%7B1%7D%7B5%7D)
![\frac{7}{12}-\frac{5}{8}=\frac{14}{24}-\frac{15}{24}=\frac{14-15}{24}=-\frac{1}{24}](https://tex.z-dn.net/?f=%5Cfrac%7B7%7D%7B12%7D-%5Cfrac%7B5%7D%7B8%7D%3D%5Cfrac%7B14%7D%7B24%7D-%5Cfrac%7B15%7D%7B24%7D%3D%5Cfrac%7B14-15%7D%7B24%7D%3D-%5Cfrac%7B1%7D%7B24%7D)
![-\frac{1}{3}+\frac{5}{6}=-\frac{2}{6}+\frac{5}{6}=\frac{5-2}{6}=\frac{3}{6}=\frac{1}{2}](https://tex.z-dn.net/?f=-%5Cfrac%7B1%7D%7B3%7D%2B%5Cfrac%7B5%7D%7B6%7D%3D-%5Cfrac%7B2%7D%7B6%7D%2B%5Cfrac%7B5%7D%7B6%7D%3D%5Cfrac%7B5-2%7D%7B6%7D%3D%5Cfrac%7B3%7D%7B6%7D%3D%5Cfrac%7B1%7D%7B2%7D)
3.
-|1,7 -
![\frac{1}{2}](https://tex.z-dn.net/?f=+%5Cfrac%7B1%7D%7B2%7D+)
| - |
![\frac{1}{2}+\frac{1}{4}](https://tex.z-dn.net/?f=+%5Cfrac%7B1%7D%7B2%7D%2B%5Cfrac%7B1%7D%7B4%7D)
| = -|
![\frac{17}{10}- \frac{5}{10}](https://tex.z-dn.net/?f=+%5Cfrac%7B17%7D%7B10%7D-+%5Cfrac%7B5%7D%7B10%7D)
| - |
![\frac{2}{4}+\frac{1}{4}](https://tex.z-dn.net/?f=+%5Cfrac%7B2%7D%7B4%7D%2B%5Cfrac%7B1%7D%7B4%7D)
| = -|
![\frac{17-5}{10}](https://tex.z-dn.net/?f=+%5Cfrac%7B17-5%7D%7B10%7D)
| - |
![\frac{2+1}{4}](https://tex.z-dn.net/?f=+%5Cfrac%7B2%2B1%7D%7B4%7D)
| = -|
![\frac{12}{10}](https://tex.z-dn.net/?f=+%5Cfrac%7B12%7D%7B10%7D)
| - |
![\frac{3}{4}](https://tex.z-dn.net/?f=+%5Cfrac%7B3%7D%7B4%7D)
| =
![-\frac{6}{5} - \frac{3}{4}](https://tex.z-dn.net/?f=-%5Cfrac%7B6%7D%7B5%7D+-+%5Cfrac%7B3%7D%7B4%7D)
=
![-\frac{24}{20} - \frac{15}{20}](https://tex.z-dn.net/?f=-%5Cfrac%7B24%7D%7B20%7D+-+%5Cfrac%7B15%7D%7B20%7D)
=
![-\frac{24+15}{20}](https://tex.z-dn.net/?f=-%5Cfrac%7B24%2B15%7D%7B20%7D)
=
![-\frac{39}{20}](https://tex.z-dn.net/?f=-%5Cfrac%7B39%7D%7B20%7D)
= -1
![\frac{19}{20}](https://tex.z-dn.net/?f=%5Cfrac%7B19%7D%7B20%7D)
4.
-0,77 < n < -0,66
n = -0,7