Корень из 2/2*2cos / корень из 2/2*2cos=корень 2/2 сокращается остается cos2/cos2=1
2х^2-3х+1=0
D=b^2-4ac= (-3)^2-4*2*1=9-8=1
x1=3+1/4= 4/4=1
x2=3-1/4=2/4=0,5
Х•(х-3)=54. Х^2-3х-54=0. Д=9+216=225. Х=(3+-15)/2. Х1=9. Х2=-12. Одна сторона 9. Другая 9-3=6
8x - 3 = 6x + 11
8x - 6x = 11 + 3
2x = 14
х = 14 : 2
x = 7
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8a + 14 = 4a - 26
8a - 4a = - 26 - 14
4a = - 40
а = - 40 : 10
a = - 10
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4x + 12 = 3x + 8
4x - 3x = 8 - 12
x = - 4
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10 + 5y = 3y - 8
5y - 3y = - 8 - 10
2y = - 18
у = (- 18) : 2
y = - 9
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10c - 5 = 8c + 1
10c - 8c = 1 + 5
2c = 6
с = 6 : 2
c = 3
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3x - 17 = 18 - 2x
3x + 2x = 18 + 17
5x = 35
х = 35 : 5
<span>x = 7</span>