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OlyaIvanova1109
@OlyaIvanova1109
June 2022
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!!Помогите!!Решите уравнение
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A) x²-6x+5=0
D=6²-4*5=36-20=16
x₁=(6-4)/2=1
x₂=(6+4)/2=5
Ответ: 1; 5.
б) -x²+7x+8=0
x²-7x-8=0
D=7²-4*(-8)=49+32=81
x₁=(7-9)/2=-1
x₂=(7+9)/2=8
Ответ: -1; 8.
в) 5x²-8x+3=0
D=8²-4*5*3=64-60=4
x₁=(8-2)/10=0.6
x₂=(8+2)/10=1
Ответ: 0,6; 1.
г) 4x²-4x+1=0
(2x-1)²=0
2x-1=0
2x=1
x=1 : 2
x=0.5
Ответ: 0,5
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Answers & Comments
Verified answer
A) x²-6x+5=0D=6²-4*5=36-20=16
x₁=(6-4)/2=1
x₂=(6+4)/2=5
Ответ: 1; 5.
б) -x²+7x+8=0
x²-7x-8=0
D=7²-4*(-8)=49+32=81
x₁=(7-9)/2=-1
x₂=(7+9)/2=8
Ответ: -1; 8.
в) 5x²-8x+3=0
D=8²-4*5*3=64-60=4
x₁=(8-2)/10=0.6
x₂=(8+2)/10=1
Ответ: 0,6; 1.
г) 4x²-4x+1=0
(2x-1)²=0
2x-1=0
2x=1
x=1 : 2
x=0.5
Ответ: 0,5