15•(11х-74)=45
165х-1110=45
165х=45+1110
165х=1155
х=7
б)
(42-22а)•4.5=90
189-99а=90
-99а=90-189
-99а=-99
а=1
15•(11х-74)=45
165х-1110=45
165х=45+1110
165х=1155
х=7
б)
(42-22а)•4.5=90
189-99а=90
-99а=90-189
-99а=-99
а=1
11х - 74 = 3
11х = 3 + 74
11х = 77
х = 7
б) 42 - 22а = 90 : 4,5
42 - 22а = 20
-22а = 20 - 42
-22а = -22
а = 1