x²+(k+2)x+(k+1)怎么算?

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x²+(k+2)x+(k+1)怎么算?

x²+(k+2)x+(k+1)怎么算?
x²+(k+2)x+(k+1)怎么算?

x²+(k+2)x+(k+1)怎么算?
x2+(k+2)x+(k+1)=(x+k+1)(x+1)