因式分解 x平-y平+2y-1?
回答 (1)
2017-01-31 1:40 am
x²-y²+2y-1
=x²-(y²-2y+1)
=x²-(y-1)²
=(x-y+1)(x+y-1)
=x²-(y²-2y+1)
=x²-(y-1)²
=(x-y+1)(x+y-1)
收錄日期: 2021-04-18 16:01:25
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