2c(9-p²)= 2c(3-c)(3+c)
3k(y²-1)= 3k(y-1)(y+1)
3(x²-25a²)= 3(x-5a)(x+5a)
-2a(y²-a²)= -2a(y-a)(y+a)= 2a(a-y)(y+a)
5x(x²-a²)= 5x(x-a)(x+a)
bc(c²-b²)= bc(c-b)(c+b)
-9х-7<7х
(-9х-7)² < (7x)²
81x² + 126x +49 < 49x²
32x² + 126x +49 < 0
D = 126² - 4*32*49 = 15876 - 6272 = 9604 > 0
√D = √9604 = 98
x1 = (-126+98) \ 64= -(24\68) = -(6\17)
x2 = (-126 - 98) \ 64 = -(224\68) = -3,5
x ∈ (-∞; -(6\17]U[-3,5; ∞)
1) 195+Х=218
Х = 218-195
Х=23
2) 381 -Х= 149
Х=232
3) 138+Х=108
Х= -30
4) Х+48=357
Х= 309
5) 157 - У=123
у= 34
6) Т+7=53
Т = 46
<span>(x+6)*(x^2-6x+36)-x*(x-9)^2=4x*(4,5x-13,5)
x</span>³+216-x³+18x²-81x-18x²+54x=0
27x=216
x=216:27
x=8
Подставляем все значения
-3*0.5(это 1/2)*8*0.5*2=-1.5*4*2=-1.5*8=-12