(1/9 + 7/18 -11/27 - 5/18)z = 5/2
(3/27 + 3/27 - 11/27)z = 5/2
-5/27 * z = 5/2
z = -(5/2):(5/27)
z = -(5/2)*(27/5)
z = -27/2 = -13.5
2)
(1 - 11/18 + 7/18 - 23/18)a = 1/3
(18/18 - 27/18)a = 1/3
-1/2 * a = 1/3
a = -(1/3):(1/2)
a = -(1/3)*2 = -2/3
80-(53+7)=80-60=20 или 80-(53+7)=80-53-7=20
268,8 : 0.56 = 26880 :56 ( убираем дробь, умножая на 100)
_26880|<u>56</u>_
<u>224</u> | 480
_448
<u> 448</u>
0