Объяснение:
А)
3(1 - х) + 5х = 10
3 - 3х + 5х = 10
-3х + 5х = 10 - 3
2х = 7
х = 7 : 2
х = 3,5
Б)
7х - 3(х + 6) = -6
7х - 3х - 18 = -6
4х - 18 = -6
4х = -6 + 18
4х = 12
х = 12 : 4
х = 3
В)
5х - 2(3 - 2х) = 13
5х - 6 + 4х = 13
5х + 4х = 13 + 6
9х = 19
х = 19 : 9
х = 19/9
х = 2 1/9
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Answers & Comments
Объяснение:
А)
3(1 - х) + 5х = 10
3 - 3х + 5х = 10
-3х + 5х = 10 - 3
2х = 7
х = 7 : 2
х = 3,5
Б)
7х - 3(х + 6) = -6
7х - 3х - 18 = -6
4х - 18 = -6
4х = -6 + 18
4х = 12
х = 12 : 4
х = 3
В)
5х - 2(3 - 2х) = 13
5х - 6 + 4х = 13
5х + 4х = 13 + 6
9х = 19
х = 19 : 9
х = 19/9
х = 2 1/9