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BOTAN1337228101
@BOTAN1337228101
July 2022
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Помогите пожалуйста срочно!!!!!!!!!!!!! 7 класс. Алгебра.
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3) 3x - (x + 3) = 3x - x - 3 = 2x - 3
4) (7b - 3) - (b + 6) - (5b - 11) = 7b - 3 - b - 6 - 5b + 11 = b + 2
если b = 243,8 , то 243,8 + 2 = 245,8
5) (4a - 7b) + (2a - b) - (5a - 6b) = 4a - 7b + 2a - b - 5a + 6b = a- 2b
6) 4x(x - 1) - 3x(2x + 4) = 4x² - 4x - 6x² - 12x = - 2x² - 16x
если x = - 1 , то - 2 * ( - 1)² - 16 * ( - 1) = - 2 * 1 + 16 = - 2 + 16 = 14
7) 2a(a + b) - b(2a - b) - b(b + 1) = 2a² + 2ab - 2ab + b² - b² - b = 2a² - b
если a = - 0,5 , b = - 0,4 , то
2 * (- 0,5)² - (- 0,4) = 2 * 0,25 + 0,4 = 0,5 + 0,4 = 0,9
8) 3x(2x - 1) - 6x(x + 4) = 81
6x² - 3x - 6x² - 24x = 81
- 27x = 81
x = - 3
2 votes
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Universalka
Verified answer
3-1)
4-4)
5-2)
6-3)
7-3)
8-4)
2 votes
Thanks 1
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Answers & Comments
4) (7b - 3) - (b + 6) - (5b - 11) = 7b - 3 - b - 6 - 5b + 11 = b + 2
если b = 243,8 , то 243,8 + 2 = 245,8
5) (4a - 7b) + (2a - b) - (5a - 6b) = 4a - 7b + 2a - b - 5a + 6b = a- 2b
6) 4x(x - 1) - 3x(2x + 4) = 4x² - 4x - 6x² - 12x = - 2x² - 16x
если x = - 1 , то - 2 * ( - 1)² - 16 * ( - 1) = - 2 * 1 + 16 = - 2 + 16 = 14
7) 2a(a + b) - b(2a - b) - b(b + 1) = 2a² + 2ab - 2ab + b² - b² - b = 2a² - b
если a = - 0,5 , b = - 0,4 , то
2 * (- 0,5)² - (- 0,4) = 2 * 0,25 + 0,4 = 0,5 + 0,4 = 0,9
8) 3x(2x - 1) - 6x(x + 4) = 81
6x² - 3x - 6x² - 24x = 81
- 27x = 81
x = - 3
Verified answer
3-1)4-4)
5-2)
6-3)
7-3)
8-4)