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selenamarigom
@selenamarigom
July 2022
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Решите уравнение : з)3x^2-x+2=0 ж)7x^2-4=0 е)2-3x=5x^2
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veretenni
З)
3x^2-x+2=0
D=b
²-4ac=(-1)²-4*3*2=-23
ж)7x^2-4=0
7x²=4
x²=4÷7
x²=4/7
е)2-3x=5x^2
2-3x-5
²=0
-5x
²-3x+2=0
D=b
²-4ac=3²-4*5(-2)=49
x
₁.₂=-b+-√D/2a
x1=-3-7/2*5=-1 x
₂=-3+7/2*5=2/5
x=1- x=2/5
1 votes
Thanks 2
Irisha110902
З) 3х*2-х+2=0
6х-х+2=0
5х=-2
х=-0,4
ж) 7х*2-4=0
14х-4=0
Х=2/7
Е) 2-3х=5х*2
10х+3х=2
13х=2
Х=2/13
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veretenni
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Answers & Comments
D=b²-4ac=(-1)²-4*3*2=-23
ж)7x^2-4=0
7x²=4
x²=4÷7
x²=4/7
е)2-3x=5x^2
2-3x-5²=0
-5x²-3x+2=0
D=b²-4ac=3²-4*5(-2)=49
x₁.₂=-b+-√D/2a
x1=-3-7/2*5=-1 x₂=-3+7/2*5=2/5
x=1- x=2/5
6х-х+2=0
5х=-2
х=-0,4
ж) 7х*2-4=0
14х-4=0
Х=2/7
Е) 2-3х=5х*2
10х+3х=2
13х=2
Х=2/13