1)7
2)12
Пошаговое объяснение:
5 · (х – 4) – 9 = х – 1.
5х-20-9=х-1
5х-29=х-1
5х-х=-1+29
4х=28
х=7
10 – 2 · (7 – х) = 4 · (х – 7);
10-14+2х=4х-28
-4+2х=4х-28
-4+28=4х-2х
24=2х
12=х
1)5·(х – 4)–9 = х – 1.
5x - 20 - 9 = x - 1
4x = 28
x = 7
2) 10–2·(7 – х) = 4·(х – 7)
10-14+2x = 4x - 28
-2x = -24
x = 12
1)7
2)12
Пошаговое объяснение:
5 · (х – 4) – 9 = х – 1.
5х-20-9=х-1
5х-29=х-1
5х-х=-1+29
4х=28
х=7
10 – 2 · (7 – х) = 4 · (х – 7);
10-14+2х=4х-28
-4+2х=4х-28
-4+28=4х-2х
24=2х
12=х
1)5·(х – 4)–9 = х – 1.
5x - 20 - 9 = x - 1
4x = 28
x = 7
2) 10–2·(7 – х) = 4·(х – 7)
10-14+2x = 4x - 28
-2x = -24
x = 12