Răspunsuri

2014-05-20T17:38:19+03:00
a) 2x·3x+5x·x-3x²·2+x²= 6x²+5x²-6x²+x² =6x²
b)  5a·3a-4a²·2+a·7a-3·2a²+4a² = 15a²-8a²+7a²-6a²+4a² = 12a²

2 5 2