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Matematică.
12. Efectuați calculele:
a) (x + 4)(x-3) - (x - 1)(x + 6);
c) (2x - 1)(x + 3) -2(x2 + x + 1);
e) (2x - 3)(3x - 2(x + 1)] + x(2x - 1).
b) (7x - 1)(x – 3) - 5(x + 2)(x + 4);
d) (x − 3)(2x – 3(x - 1)] + x(x + 5);
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