18, 27, 36, 45. Числовому промежутку принадлежит 4 числа.
1) <span>16.7-(-8.9)= 16.7 + 8.9= 25.6
2)7.2-8.9= -1.7
3) 0 - 5.7= - 5.7
4) -13.6 - 14.4= -28
5) -14.8-(-8.12) = -14.8 + 8.12= -6. 68
6) 0 -(-19.3) = 19.3
7) </span>-7/24-(-17/36)=
![\frac{7}{24}](https://tex.z-dn.net/?f=+%5Cfrac%7B7%7D%7B24%7D+)
+
![\frac{17}{36}](https://tex.z-dn.net/?f=+%5Cfrac%7B17%7D%7B36%7D+)
= -
![\frac{21}{72}](https://tex.z-dn.net/?f=+%5Cfrac%7B21%7D%7B72%7D+)
+
![\frac{34}{72}](https://tex.z-dn.net/?f=+%5Cfrac%7B34%7D%7B72%7D+)
=
![\frac{13}{72}](https://tex.z-dn.net/?f=+%5Cfrac%7B13%7D%7B72%7D+)
8) <span>2/9-1/3= </span>
![\frac{2-3}{9}](https://tex.z-dn.net/?f=+%5Cfrac%7B2-3%7D%7B9%7D+)
= -
![\frac{1}{9}](https://tex.z-dn.net/?f=+%5Cfrac%7B1%7D%7B9%7D+)
9) 3 1/5-(-4 1/7)=
![\frac{16}{5}](https://tex.z-dn.net/?f=+%5Cfrac%7B16%7D%7B5%7D+)
+
![\frac{29}{7}](https://tex.z-dn.net/?f=+%5Cfrac%7B29%7D%7B7%7D+)
=
![\frac{112}{35}](https://tex.z-dn.net/?f=+%5Cfrac%7B112%7D%7B35%7D+)
+
![\frac{145}{35}](https://tex.z-dn.net/?f=+%5Cfrac%7B145%7D%7B35%7D+)
=
![\frac{157}{35}](https://tex.z-dn.net/?f=+%5Cfrac%7B157%7D%7B35%7D+)
= 4
![\frac{x}{y} \frac{17}{35}](https://tex.z-dn.net/?f=+%5Cfrac%7Bx%7D%7By%7D++%5Cfrac%7B17%7D%7B35%7D+)
W + 175 = 12000 : 24
W + 175 = 500
W = 500 - 175
W = 325
_____
12000 : (325 + 175) = 24
Прямая касается окружности, то есть является касательной.