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sadcat00009
@sadcat00009
August 2021
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slavinaalena
9.
(x-2)² + 8x= (x-1)(x+1)
x² - 4x+ 4 + 8x= x²+x-x-1
-4x+8x-x+x= -1-4
4x= -5
x= -5/4
10. 2(3x-y)-5=2x-3y 6x-2y-5=2x-3y 4x+y=5 y=5-4x 7x=21
5-(x-2y)=4y+16 ⇔ 5-x+2y=4y+16 ⇔ -x-2y=11 ⇔ -x-10+8x=11 ⇔ y=5-4x
⇔ x=3,
y= -7.
Ответ : S= (3; -7).
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Answers & Comments
(x-2)² + 8x= (x-1)(x+1)
x² - 4x+ 4 + 8x= x²+x-x-1
-4x+8x-x+x= -1-4
4x= -5
x= -5/4
10. 2(3x-y)-5=2x-3y 6x-2y-5=2x-3y 4x+y=5 y=5-4x 7x=21
5-(x-2y)=4y+16 ⇔ 5-x+2y=4y+16 ⇔ -x-2y=11 ⇔ -x-10+8x=11 ⇔ y=5-4x
⇔ x=3,
y= -7.
Ответ : S= (3; -7).