怎么解x的三次方减2X的二次方再加1

2024-12-28 22:02:56
推荐回答(2个)
回答1:

x的三次方减2X的二次方再加1=x的三次方-X的二次方-X的二次方+1
=x的三次方-X的二次方-(X的二次方-1)
=X的二次方(X-1)-(X+1)(X-1)
=(X-1)(X的二次方-X-1)

回答2:

解:原式=x³-2x² +x -x+1
=(x³-2x² +x) -(x-1)
=x(x²-2x+1)-(x-1)
=x(x-1)²-(x-1)
=(x-1)[x(x-1)-1]
=(x-1)(x²-x-1)

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