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safona1999
@safona1999
July 2022
2
5
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Очень буду благодарна!!!
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Rossomaxa2001
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
1 votes
Thanks 1
safona1999
Спасибо большое :333
m11m
в 737 ошибка: -18х-8х=-26х , а не -24х
m11m
325.
28x²
- 4x =
28x²
- 4x =
4x²
- 4x =
4x²-4x(x-1)
=
4x²-4x²+4x
=
4x
7x-7 7(x-1) x-1 x-1 x-1 x-1
335.
(
a
+
81b
-18) *
1
= (
a²+81b²-18ab
) *
1
=
(a-9b)²
*
1
=
a-9b
=
( b a ) a-9b ( ab ) a-9b ab a-9b ab
=
a
-
9b
=
1
-
9
ab ab b a
726.
5x+1
+ 5=x
7
5x+1+35=7x
5x-7x=-36
-2x=-36
x=18
Ответ: 18.
732.
5x-5
-2x =2
3
5x-5-6x=6
-x=11
x=-11
Ответ: -11.
737.
(х-9)²=(х+4)²
(х-9)²-(х+4)²=0
(х-9-х-4)(х-9+х+4)=0
-13(2х-5)=0
2х-5=0
2х=5
х=2,5
Ответ: 2,5
2 votes
Thanks 1
safona1999
спасибо огромное!
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Answers & Comments
28x² - 4x = 28x² - 4x = 4x² - 4x =4x²-4x(x-1) =4x²-4x²+4x = 4x
7x-7 7(x-1) x-1 x-1 x-1 x-1
335.
( a + 81b -18) * 1 = (a²+81b²-18ab) * 1 = (a-9b)² * 1 = a-9b =
( b a ) a-9b ( ab ) a-9b ab a-9b ab
= a - 9b = 1 - 9
ab ab b a
726.
5x+1 + 5=x
7
5x+1+35=7x
5x-7x=-36
-2x=-36
x=18
Ответ: 18.
732.
5x-5 -2x =2
3
5x-5-6x=6
-x=11
x=-11
Ответ: -11.
737.
(х-9)²=(х+4)²
(х-9)²-(х+4)²=0
(х-9-х-4)(х-9+х+4)=0
-13(2х-5)=0
2х-5=0
2х=5
х=2,5
Ответ: 2,5