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Sashuli4ca0326
@Sashuli4ca0326
June 2022
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(х+3)(5х-1)-(4х-3)(х+1)=25+13х
Решить уравнение 7 класс, срочно помогите.
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Answers & Comments
ShirokovP
Verified answer
5x^2 + 14x - 3 - (4x^2 + x - 3) - 13x - 25 = 0
5x^2 + 14x - 3 - 4x^2 - x + 3 - 13x - 25 = 0
x^2 - 25 = 0
x^2 = 25
x = ± √25
x = ± 5
Ответ
- 5; 5
1 votes
Thanks 1
Sashuli4ca0326
Откуда такие числа?
ShirokovP
какие?
Sashuli4ca0326
Откуда 14, откуда эта общая скобка взялась?
ShirokovP
раскрыл скобки
ShirokovP
5x^2 - x + 15x - 3 = 5x^2 + 14x - 3
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Answers & Comments
Verified answer
5x^2 + 14x - 3 - (4x^2 + x - 3) - 13x - 25 = 05x^2 + 14x - 3 - 4x^2 - x + 3 - 13x - 25 = 0
x^2 - 25 = 0
x^2 = 25
x = ± √25
x = ± 5
Ответ
- 5; 5