Предмет: Математика, автор: aika9812

Помогите, пожалуйста.
Только нужно, чтобы было решение. Ну, не сразу ответ.

Приложения:

Ответы

Автор ответа: evvoronina1
0
2, (5^4 • 5^3) / 125^2 = 5^7 / (5^3)^2 =
= 5^7 / 5^6 = 5
Ответ: в) 5т: б)


3. 0,4 • √10 • √250 + √169
= 0,4 • √10 • √(25•10) + 13 =
= 0,4 • √10 • 5 • √10 + 13 =
= 2•10 + 13 = 20+13 = 33
Ответ: в) 33

4) 2х^2 - 18=
2(х^2 - 9) = 0
х^2 - 9 = 0:2
х^2 - 9 = 0
(х+3)•(х-3) = 0
х1 = -3
х2 = 3
Ответ б) -3: 3
!и тт
5) Площадь прямоугольного треугольника равна
S=a•b
У Вас на картинке нет размеров треугольника!

6)
а)√98 = 7√2 - верное равенство, так как
√98 = √(7•7•2) = 7√2
б) √1,44 = -1,2 это возможно, так как
√1,44 = +1,2 и -1,2, ведь (-1,2)^2 = 1,44
в) 1/√2 = √2/2 - верное равенство, так как
√2/2 = √2/(√2 • √2) = 1/√2
г) (1-√3)(1+√3) = 1^2 - (√3)^2 = 1 - 3 = -2 - верное равенство.
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