Răspunsuri

2014-10-03T16:44:33+03:00
1. =6x-2x^2+9-3x+1-x^2=-3x^2+3x+10
2.=6a^2+4a+9a+6+a+3=6a^2+14a+9
3.=2a-6-a^2+3a+a^2-a=4a-6