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Lirey2001
@Lirey2001
November 2021
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Срочно! Через 25 минут сдавать! Решить Урвнения! 1,2 и 3 только!
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Глокси
1)(x²-4)*2-(5x-2)=6
2x²-8-5x+2-6=0
2x²-5x-12=0
D=25+96=121
x=5+11 /4=4
x=5-11 /4==1.5
2)x²+2x=y
y²-7y-8=0
y=8 y=-1 по теореме Виета
x²+2x=8 x²+2x=-1
x²+2x-8=0 x²+2x+1=0
x=-4 (x+1)²=0
x=2 x=-1
3)x²+3x=y
(y+1)(y+3)=-1
y²+3y+y+3+1=0
y²+4y+4=0
(y+2)²=0
y=-2
x²+3x+2=0
x=-2
x=-1
3 votes
Thanks 2
Lirey2001
Огромное спасибо, очень выручили!
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Answers & Comments
2x²-8-5x+2-6=0
2x²-5x-12=0
D=25+96=121
x=5+11 /4=4
x=5-11 /4==1.5
2)x²+2x=y
y²-7y-8=0
y=8 y=-1 по теореме Виета
x²+2x=8 x²+2x=-1
x²+2x-8=0 x²+2x+1=0
x=-4 (x+1)²=0
x=2 x=-1
3)x²+3x=y
(y+1)(y+3)=-1
y²+3y+y+3+1=0
y²+4y+4=0
(y+2)²=0
y=-2
x²+3x+2=0
x=-2
x=-1