Lg (2x² - 4x + 12) = lg(x*(x+3))
2x² - 4x +12 = x² +3x
x²- 7x +12 =0
D = 49-48 = 1
x₁ = (7+1) /2 =4
x₂ = (7-1) /2=3
Ответ: 4; 3
1) 4а⁴ *( (-2)³*b²)²= 4a⁴*( -8 *b²)²=4a⁴* 64*b⁴= 256 *a⁴*b⁴ = (4*a*b)⁴
2) ( -x⁵ *y)³ * 6x³*y²= -x¹⁵*y³*6x³*y²= - 6x¹⁸y⁵
3) (-0.3a⁴b c³)² * 5a²c⁶=( 0.09*a⁸*b²*c⁶)* (5*a²*c⁶)= 0.45*a¹°b²c¹²
Sina*ctga*cosa=(cosa)^2=1-(sina)^2=1-4/25=21/25