1,5а²=2,25а+2в²=4в+2а²=4а²-в²
У - функция, х - аргумент, все просто: 3*1-2=1=у, ответ: 1.
<span>4(1 - 5х) = 9 - 3(6х - 5)
4-20x=9-18x+15
-20x+18x= -4+15+9
-2x= -20
x=10</span>
3 - 4sin²(3x + π/3) = 0
3 = 4sin²(3x + π/3)
sin²(3x + π/3) = 3/4
sin(3x + π/3) = ±√3/2
1) sin(3x + π/3) = √3/2
3x + π/3 = (-1)ⁿπ/3 + πn, n ∈ Z
x = (-1)ⁿπ/9 - π/9 + πn/3, n ∈ Z
2) sin(3x + π/3) = -√3/2
3x + π/3 = (-1)ⁿ+¹π/3 + πn, n ∈ Z
x = (-1)ⁿ+¹π/9 - π/9 + πn/3, n ∈ Z