a^2-b^2+2b-1=???
列明step
f.2 math
2011-09-17 5:23 am
回答 (1)
2011-09-17 5:29 am
✔ 最佳答案
a²-b²+2b-1=a²-(b²-2b+1)
=a²-[b²-2(1)(b)+1²]
=a²-(b-1)²
=[a+(b-1)][a-(b-1)]
=(a+b-1)(a-b+1)
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