a³+3a²+3a+2 5
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a³+3a²+3a+2
=a³+1+3a²+3a+1
=(a+1)(a^2-a+1)+3a(a+1)+1
=(a+1)(a^2-a+1+3a)+1
=(a+1)(a^2+2a+1)+1
=(a+1)(a+1)^2+1
=(a+1)^3+1
=[(a+1)+1][(a+1)^2-(a+1)+1]
=(a+2)(a^2+2a+1-a-1+1)
=(a+2)(a^2+a+1)
=a³+1+3a²+3a+1
=(a+1)(a^2-a+1)+3a(a+1)+1
=(a+1)(a^2-a+1+3a)+1
=(a+1)(a^2+2a+1)+1
=(a+1)(a+1)^2+1
=(a+1)^3+1
=[(a+1)+1][(a+1)^2-(a+1)+1]
=(a+2)(a^2+2a+1-a-1+1)
=(a+2)(a^2+a+1)
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