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band69
@band69
July 2022
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Решите пожалуйста срочно надо :с (Алгебра)
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oganesbagoyan
Verified answer
6)
a(n+1) = a(n) +4 ⇒ d =4 (разность прогрессии)
S(16) = ( (2a
₁ +15d) /2 ) *16= (2*(-9) +15*4)*8 =42*8 = 332.
ответ : 332.
------
7)
1/6x -(6x+y) / 6xy = (y -6x -y) /6xy = -6x/6xy = - 1/ y ,если x
≠0
-1/(1/4) =
- 4
ответ : -4 .
----
8)
x² -49 < 0 ;
(x+7)(x-7) <0;
методом интервалов :
" +" "-" "+"
------------- (-7) ////////////// (7)------------
ответ : x ∈ (-7 ; 7).
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Answers & Comments
Verified answer
6)a(n+1) = a(n) +4 ⇒ d =4 (разность прогрессии)
S(16) = ( (2a₁ +15d) /2 ) *16= (2*(-9) +15*4)*8 =42*8 = 332.
ответ : 332.
------
7)
1/6x -(6x+y) / 6xy = (y -6x -y) /6xy = -6x/6xy = - 1/ y ,если x≠0
-1/(1/4) = - 4
ответ : -4 .
----
8)
x² -49 < 0 ;
(x+7)(x-7) <0;
методом интервалов :
" +" "-" "+"
------------- (-7) ////////////// (7)------------
ответ : x ∈ (-7 ; 7).