1.Б
7.
6/x² - 12/x = 3/1
6/x²-12x/x² = 3x²/x²
6-12x-3x²=0
3x²+12x-6=0
x²+4x-2=0
Д(Дискриминант)=16+4×2=24
x1=2√6-4/2=√6-2
x2=-2√6-4/2=-√6-2
1.Б
7.
6/x² - 12/x = 3/1
6/x²-12x/x² = 3x²/x²
6-12x-3x²=0
3x²+12x-6=0
x²+4x-2=0
Д(Дискриминант)=16+4×2=24
x1=2√6-4/2=√6-2
x2=-2√6-4/2=-√6-2