4). Calculaţi:
a). (x + 5)²-(x + 3)(x-1)-(x - 2)² =
c). (x + 2y)-(x + y)−(x√3+ y√27)² =
3
e). (-a-3b)* + (a + b).(-²a + b ) =
2
4
b). (2x - 3)²+(-2x) (x + 5)-(1 + x)² =
d). (√5 − √10)² – (√TO + 2√5)² =
-
9
x√3/2 + 1)]. (x√² + 3)- (3x + √²)² =
f). X₁