1) 4X + 7X^2 = 0
X*( 4 + 7X) = 0
X1 = 0
7X = - 4
X2 = - 4/7
ответ 0 ; - 4/7
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2) 13Х = 0,26X^2
13X - 0,26X^2 = 0
13X * ( 1 - 0,02X) = 0
13X = 0
X1 = 0
1 - 0,02X = 0
X2 = 50
Ответ 0 ; 50
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3) 64X^2 - 169 = 0
( 8X - 13) * ( 8X + 13) = 0
8X - 13 = 0
X2 = 1,625
8X + 13 = 0
X2 = - 1,625
Ответ 1,625 ; - 1,625
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4) 9X^2 + 28^2 = 197^2
9X^2 = 197^2 - 28^2 = ( 197 - 28)*( 197 + 28) = 169 * 225
V ( 9X^2) = V ( 169 * 225)
3X = 13 * 15
X = ( 13 * 15) / 3 = 13 * 5 = 45
Ответ 45 ; - 45
<span>2/x-4-x+8/x^2-16-1/x = </span>
![\frac{2x+8-x-8-x+16}{x2-16}](https://tex.z-dn.net/?f=%20%5Cfrac%7B2x%2B8-x-8-x%2B16%7D%7Bx2-16%7D%20)
=
![\frac{16}{ x^{2} -16}](https://tex.z-dn.net/?f=%20%5Cfrac%7B16%7D%7B%20x%5E%7B2%7D%20-16%7D%20)
Ответ:
x+2=4
x=4-2
x=2
2+2=4
Объяснение:
я зделал полноґоє ришения