50БАЛЛОВ
1) (4x – 1)/9 – (x + 2)/6 = 2;
2) (3x – 5)(2x + 7) = (3x + 1)(2x – 3) + 4x.
Распишите пожалуйста
1) (4x – 1)/9 – (x + 2)/6 = 2;
2) (3x – 5)(2x + 7) = (3x + 1)(2x – 3) + 4x.
Распишите пожалуйста
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Объяснение:
№1
(4х - 1)/9 - (х + 2)/6 = 2 | * 18
2(4х - 1) - 3(х + 2) = 36
8х - 2 - 3х - 6 = 36
5х - 8 = 36
5х = 36 + 8
5х = 44
х = 44 : 5
х = 8,8
№2
(3х - 5)(2х + 7) = (3х + 1)(2х - 3) + 4х
6х² + 21х - 10х - 35 = 6х² - 9х + 2х - 3 + 4х
6х² + 11х - 35 = 6х² - 3х - 3
11х - 35 = -3х - 3
11х + 3х = -3 + 35
14х = 32
х = 32 : 14
х = 32/14
х = 16/7
х = 2 2/7