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7gklass2017
@7gklass2017
November 2021
2
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Представьте выражение в виде многочлена стандартного вида:
1) (0,5а-2b)²
2) (a-3/4b)(3/4b+a)
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Flash3146
Нужно воспользоваться формулами
(a + b)² = a² + 2ab + b²
(a - b)(a + b) = a
² - b²
1) (0,5а - 2b)² = (0,5a)
² - 2 · 0,5a · 2b + (2b)² = 0,25a² -2ab + 4b²
2) (a - 3/4b)(3/4b + a) = a
² - (3/4b)² = a² - 9/16b²
2 votes
Thanks 1
Санечка69
Verified answer
(0,5a-2b)²=0,25a²-2ab+4b²
(a-3/4b)(3/4b+a)=(a-3/4b)(a+3/4b)=a²-9/16b²
11 votes
Thanks 18
7gklass2017
Можете помочь решить уравнение https://znanija.com/task/24061707?
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Answers & Comments
(a + b)² = a² + 2ab + b²
(a - b)(a + b) = a² - b²
1) (0,5а - 2b)² = (0,5a)² - 2 · 0,5a · 2b + (2b)² = 0,25a² -2ab + 4b²
2) (a - 3/4b)(3/4b + a) = a² - (3/4b)² = a² - 9/16b²
Verified answer
(0,5a-2b)²=0,25a²-2ab+4b²(a-3/4b)(3/4b+a)=(a-3/4b)(a+3/4b)=a²-9/16b²