Предмет: Алгебра, автор: gsdfgdfgd

СРОЧНО
(2x-1)в квадраті+(1-2x)(1+2x)=7

Ответы

Автор ответа: Universalka
1

(2x - 1)² + (1 - 2x)(1 + 2x) = 7

(2x)² - 2 * 2x * 1 + 1² + 1² - (2x)² = 7

4x² - 4x + 1 + 1 - 4x² = 7

- 4x = 7 - 2

- 4x = 5

x = - 1,25

gsdfgdfgd: а чого -1,25 якщо -4+5=1
gsdfgdfgd: якщо поясниш поставлю як найкращий
gsdfgdfgd: ау
gsdfgdfgd: ау.
gsdfgdfgd: аууу
gsdfgdfgd: ауууууууууу
Universalka: x = 5 : (- 4) = - 1,25 Откуда - 4 + 5 ?
gsdfgdfgd: Аааа понял спасибо( забыл просто)
Автор ответа: gnnitetskiyvlad
0

(2x-1)^2+(1-2x)(1+2x)=7

2x^2-4x+1+1-2x^2=7

-4x+1+1=7

-4x=5

x=-5/4=-1,25

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