Răspunsuri

2014-05-02T13:13:24+03:00
A*(a+1)*(a+2)+ (a+1)=(a+1)^3 (a^2 +a)* (a+2) +(a+1)= a^3 +3a^2+ 3a + 1 a^3 +2a ^2 +a ^2 +2a +a +1= a^3 +3a^2 +3a+1 a^3 +3a^2 +3a+1=a^3 +3a^2+ 3a +1
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