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9. Efectuati: a) (x+1)² + x(x--2); 3(a-4)-(a+3)²; e) (x + 5)² + (2x + 1)²; c) You? b) (2+a)²-2a(a-1); d) (x + 3)² --(4+ x)² ; f) (3x + 1)²-(1-2x) (2x + 1);​

9 Efectuati A X1 Xx2 3a4a3 E X 5 2x 1 C You B 2a2aa1 D X 3 4 X F 3x 112x 2x 1 class=