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InestaEXX
@InestaEXX
August 2021
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Помогите с д\з
Алгебра 8-й класс
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m11m
1.
x²+2=x+2
x²-x+2-2=0
x²-x=0
x(x-1)=0
x=0 x-1=0
x=1
Ответ: 0; 1.
2.
b -
2a
*
a²-b²
= b -
1
*
(a-b)(a+b)
= b -
a+b
=
2b-a-b
=
b-a
a-b 4a a-b 2 2 2 2
3.
{8-x>9
{4+6x<1
8-x>9
-x>9-8
-x>1
x<-1
4+6x<1
6x<1-4
6x<-3
x<-0.5
{x<-1
{x<-0.5
\\\\\\\\\
--------- -1 --------- -0.5 --------------
\\\\\\\\\\\\\\\\\\\\\\\\\
x<-1 или х∈(-∞; -1)
1 votes
Thanks 2
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Answers & Comments
x²+2=x+2
x²-x+2-2=0
x²-x=0
x(x-1)=0
x=0 x-1=0
x=1
Ответ: 0; 1.
2.
b - 2a * a²-b² = b - 1 * (a-b)(a+b) = b - a+b =2b-a-b = b-a
a-b 4a a-b 2 2 2 2
3.
{8-x>9
{4+6x<1
8-x>9
-x>9-8
-x>1
x<-1
4+6x<1
6x<1-4
6x<-3
x<-0.5
{x<-1
{x<-0.5
\\\\\\\\\
--------- -1 --------- -0.5 --------------
\\\\\\\\\\\\\\\\\\\\\\\\\
x<-1 или х∈(-∞; -1)