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Janeboolitle
@Janeboolitle
August 2022
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ПОМОГИТЕ ПОЖАЛУЙСТА!!!
Решить уравнение!
(5-2х)(7х-1)=(2х-5)^2
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sedinalana
Verified answer
(5-2х)(7х-1)=(2х-5)^2
35x-5-14x²+2x-4x²+20x-25=0
18x²-57x+30=0
D=3249-2160=1089
x1=(57-33)/36=2/3
x2=(57+33)/36=2,5
2 votes
Thanks 1
Janeboolitle
А можно решить это уравнение не через дискриминант,просто в 7 классе еще его не проходили?!))
zhenyaM2002
Verified answer
(5-2x)(7x-1)= (2x-5)²
35x -5-14x²+2x = 4x²-20x+25
-14x²+37x-5 = 4x²-20x+25
4x²-20x+25+14x²-37x+5 =0
18x²-57x+30 =0
a=18 , b = -57, с=30
D= b² -4ac = (-57)²-4*18*30 = 3249-2160=1089=33²
D> 0 - два корня уравнения
x₁,₂= (-b (-;+) √D) /2a
х₁= (57- 33) / (2*18) = 24/36 = 2/3
х₂= (57+33) / 36= 90/36 = 5/2 = 2,5
Ответ: х₁=
; х₂= 2,5
0 votes
Thanks 1
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Answers & Comments
Verified answer
(5-2х)(7х-1)=(2х-5)^235x-5-14x²+2x-4x²+20x-25=0
18x²-57x+30=0
D=3249-2160=1089
x1=(57-33)/36=2/3
x2=(57+33)/36=2,5
Verified answer
(5-2x)(7x-1)= (2x-5)²35x -5-14x²+2x = 4x²-20x+25
-14x²+37x-5 = 4x²-20x+25
4x²-20x+25+14x²-37x+5 =0
18x²-57x+30 =0
a=18 , b = -57, с=30
D= b² -4ac = (-57)²-4*18*30 = 3249-2160=1089=33²
D> 0 - два корня уравнения
x₁,₂= (-b (-;+) √D) /2a
х₁= (57- 33) / (2*18) = 24/36 = 2/3
х₂= (57+33) / 36= 90/36 = 5/2 = 2,5
Ответ: х₁= ; х₂= 2,5