x三次方-1除x-1

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x三次方-1除x-1
x三次方-1除x-1

x三次方-1除x-1
原式=(x-1)(x²+x+1)÷(x-1)
=x²+x+1

(x三次方-1)÷(x-1)
=(x-1)(x²+x+1)÷(x-1)
=x²+x+1