a(a-4) < (a-2)^2
a^2-4a-(a-2)^2<0
a^2-4a-(a^2-4a+4)<0
-4<0
2) 1.a=1
0+1<a+1<2+1
1<a+1<3
2. a-1=
=0 < a < 2
0-1 < a-1 < 1
3. a/2=
=0/2 < a/2 < 2/2
0 < a/2 < 1
4. 1/a=
=0/a^2 < a/a^2 < 2/a^2
0 < 1/a < 2/a^2
Объяснение:
