a³+3a²+3a+2等于几
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a³+3a²+3a+2等于几
a³+3a²+3a+2等于几
a³+3a²+3a+2等于几
原式=a³+2a²+a²+2a+a+2
=(a+2)a²+(a+2)a+(a+2)
=(a+2)(a²+a+1)
原式=a³+2a²+a+a²+2a+1+1=a(a+1)²+(a+1)²+1=(a+1)(a+1)²+1=(a+1)³+1
是因式分解吧?
a³+3a²+3a+2=﹙a³+3a²+3a+1﹚+1=﹙a+1﹚³+1=[﹙a+1﹚+1][﹙a+1﹚²-﹙a+1﹚+1]
=﹙a+2﹚﹙a²+a+1﹚