a的三次方-3a的平方+3a-1

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a的三次方-3a的平方+3a-1a的三次方-3a的平方+3a-1a的三次方-3a的平方+3a-1a³-3a²+3a-1=(a³-1)-(3a²-3a)=(a-1

a的三次方-3a的平方+3a-1
a的三次方-3a的平方+3a-1

a的三次方-3a的平方+3a-1
a ³ -3a²+3a-1
=(a ³ -1)-(3a²-3a)
=(a-1)(a ²+a+1)-3a(a-1)
=(a-1)(a ²+a+1-3a)
=(a-1)(a -1)²
=(a-1) ³

原式=(a^3-1)-(3a^2-3a)
=(a-1)(a^2+a+1)-3a(a-1)
=(a-1)(a^2-2a+1)
=(a-1)^3

是3*a方还是[3a]方啊