(ab - ad) / (abd) = a(b - d) / (abd) = (b - d) / (bd ) = 1/d - 1/b
xyz /(z * ( x-y)) = xy / (x-y)
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Х²+3-10х+6 = 0
х²-10х+9 = 0
В = 100-36 = 64(8)
х1 = (10+8)/2 = 9
х2 = (10-8)/2 = 1
3-2х>=8x-1
-2x-8x = -1 - 3
-10x = -4
x= 0,4