【单选题】在下列各式中: (1)(-2a-1) 2 ;(2)(-2a-1)(-2a+1);(3)(-2a+1)(2a+1);(4)(2a-1) 2 ;(5)(2a+1) 2 。计算结果相同的是 [ ]
【简答题】化简求值:当a=1时, a 2 -1 a 2 -2a+1 + 2a- a 2 a-2 ÷a 的值.
【简答题】个人财务分析主要从哪几个方面进行?具体分析时需要计算哪些财务比例?
【简答题】已知a= 1 3 ,求 1-2a+ a 2 a-1 - a 2 -2a+1 a 2 -a 的值.
【简答题】Do you know what American students have to do in their schools? In America, at the beginning of the term, students must choose their courses and teachers first. While in China students usually have no...
【单选题】计算 1-(a- 1 1-a ) 2 ÷ a 2 -a+1 a 2 -2a+1 的结果为( )