7 - 2х + 6 = 9 - 6х
7 + 6 - 9 = -6х + 2х
4 = - 4х
Х = - 1
<span>2sin3x=-1
</span>
<span>sin3x=-1/2
</span>
<span>3x=7п/6 +2пn
x=7п/18+2пn/3
</span>
- x² - 14x - 50 = 0
x² + 14x + 50 = 0
D = b² - 4ac = 14² - 4 · 1 · 50 = 196 - 200 = -4
x₁; x₂∉∅ т.к. D < 0
(-5,3-7,2):0,05= -12,5:0,05=-250