Log2 (x+1) + 2log4 (x+5) = 8log1/2 8
Log2 (x+1) + 2/2log2 (X+5) = -8log2 8
Log2 (x+1) + log2 (x+5) = -8 * 3
Log2 (x+1)(x+5) = -24
Log2 x^2+5x+x+5= -24
X^2+6x+5 = 0 ; > 0 не равно 1
D=36-20=16=4^2
X1,2=1;5
1 не разрешено !
z=x+y-2
x-y+2*(x+y-2)=3 x-y+2*x+2*y-4=3 3*x+y=7 y=7-3*x
x-2*y+x+y-2=1 2*x-y=3 2*x-(7-3*x)=3 2*x-7+3*x=3 5*x=10 x=2
y=7-3*2=1
z=2+1-2=1
Вроде так )))
1.a.(a-2)(a-3) = a²-3a-2a+6=a²-5a+6
b.(5x+4)(2x-1)=10x²-5x+8x-4=10x²+3x-4
в.(3p+2c)(2p+4c)=6p²+12pc+4cp+8c²=6p²+8c²+16pc
г.(b-2)(2b+2b-3)=2b²+2b²-3b-4b-4b+6=2b²+2b²-11b+6
2.x(x-y)+a(x-y)=(x-y)(x+a)
2a-2b+ca-cb=(2a+ca)-(2b+cb)=a(2+c)-b(2+c)=(2+c)(a-b)