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njhieyjdf
@njhieyjdf
July 2022
1
23
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МНОГО БАЛЛОВ!
Решите уравнения.
1)2*а в квадрате+ 2*а-24=0
2)х(х-7)=0
3)а(а-2.3)(а+9.1)=0
4) 67 в квадрате - 57 в квадрате
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Answers & Comments
meripoppins60
1) 2а² + 2а - 24 = 0
а = 2; b = 2; c= -24
D = b² - 4ac = 2² - 4 * 2 * (-24) = 4 + 192 = 196
а
₁
=
- b + √D
=
- 2 + √196
=
-2 + 14
= 3
2a 2 * 2 4
а
₂
=
- b - √D
=
- 2 - √196
=
-2 - 14
= -4
2a 2 * 2 4
2) х (х - 7) = 0
х = 0 или х - 7 = 0
х = 0 или х = 7
3) а(а - 2.3)(а + 9.1) = 0
а = 0 или а - 2,3 = 0 или а + 9,1 = 0
а = 0 или а = 2,3 или а = - 9,1
4) 67² - 57² = (67 - 57)(67 + 57) = 10 * 124 =
1240
2 votes
Thanks 1
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Answers & Comments
а = 2; b = 2; c= -24
D = b² - 4ac = 2² - 4 * 2 * (-24) = 4 + 192 = 196
а₁ = - b + √D = - 2 + √196 = -2 + 14 = 3
2a 2 * 2 4
а₂ = - b - √D = - 2 - √196 = -2 - 14 = -4
2a 2 * 2 4
2) х (х - 7) = 0
х = 0 или х - 7 = 0
х = 0 или х = 7
3) а(а - 2.3)(а + 9.1) = 0
а = 0 или а - 2,3 = 0 или а + 9,1 = 0
а = 0 или а = 2,3 или а = - 9,1
4) 67² - 57² = (67 - 57)(67 + 57) = 10 * 124 = 1240