4
a)
Efectuați
-2
x-2
x² +2
2x
b)
c)
calculele:
X
x+2
x²
xx_2x+4
2x+4
2-x
X
2-x
+
X
+
1
x² - 4x +4'
4
x²+2x
+-
4x-4
(x-1)²-1
;
