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polina32154
@polina32154
July 2022
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Решите уравнения 5,6,7 (дискриминант)
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НикитаДолжиков18
5)4х^2+5x+9=x+2
4x^2+5x-x+9-2=0
4x^2+4x+7=0
D=16-7*4*4=-96
нет корней
6)5x^2=25
5x^2-25=0
5x(x-5)=0
5x=0 x-5=0
x1=0 x2=5
7)100x^2-16=0
100x^2=16
x^2=16/10=4/25
x=2/5
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polina32154
А это квадрат ^ или что?
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Answers & Comments
4x^2+5x-x+9-2=0
4x^2+4x+7=0
D=16-7*4*4=-96
нет корней
6)5x^2=25
5x^2-25=0
5x(x-5)=0
5x=0 x-5=0
x1=0 x2=5
7)100x^2-16=0
100x^2=16
x^2=16/10=4/25
x=2/5