Răspunsuri

2014-09-21T12:15:55+03:00
2(x² + 2x + 1 ) -3(x²-4) + 5x² - 15 - (9x² - 6x + 1 )
2x² + 4x + 2 - 3x² + 12 + 5x² - 15 -9x² + 6x - 1
= -5x² + 10 x - 2