1) 4/(x²+4x+4)=4/(x+2)².
2) (x²+12)/(x²-4)-(x+2)/(x-2)=(x²+12)/((x-2)(x+2))-(x+2)/(x-2)=
=(x²+12-(x+2)²)/((x+2)(x-2))=(x²+12-x²-4x-4)/((x+2)(x-2))=(-4x-8)/((x+2)(x-2))=
=-4*(x-2)/((x+2)(x-2))=-4/(x+2).
3) (4/(x+2)²):(-4/(x+2))=4*(x+2)/(-4*(x+2)²)=-1/(x+2)=-1/(-1+2)=-1/1=-1.
Х(х²+х-10х-10) = (х²-х-3х+3)(х-5)
х³-9х²-10х = (х²-4х+3)(х-5)
х³-9х²-10х = х³-4х²+3х-5х²+20х-15
х³-9х²-10х=х³-9х²+23х-15
х³-х³-9х²+9х²-10х-23х = -15
-33х = -15
х=2,2
(х²-х-4х+4)(х+7) = х(х²+2х+1)
(х²-5х+4)(х+7) = х³+2х²+х
х³-5х²+4х+7х²-35х+28 = х³+2х²+х
х³+2х²+31х+28 -х³-2х²-х =0
30х = -28
х =-28/30 = -14/15
2a^2b+3ac=a*(2ab+3c)
x^3y^2 - x^4y= x^3y*(y-x)
5 в степени (-0,2) = 0,04
5 в степени (-1,2) = 0,144
5 (-2) < 5 (-1,2)