(2a^2-3a+1)/（1-a^2)÷(4a^2-4a+1)/(2a^2+a-1)

【1】a+a=a×a a= [ ]【2】a×a=a÷a a=[ ]【3】a×a=a－a a=[ ] [4]a－a=a＋a a(a-1)(a-2)(a-3)(a-4)因式分解 (a 1)(a 2)(a 3)(a a/a-1÷（a-a/2a-1) (a-1)(a-2)(a-3)(a-4)-3因式分解, (a+1)(a+2)(a+3)(a+4)的答案 因式分解 (a+1)(a+2)(a+3)(a+4)+24 因式分解:(a+1)(a+2)(a+3)(a+4)-120 因式分解：(1) a*4-a*3+a*2-a （高一集合）已知A={2,4,a*a*a-2a*a-a+7},B={1,a+3,a*a-2a+2,a*a*a+a*a+3 (2a^2+3a+2)/(a+1)-(a^2-a-5)/(a+2)-(3a^2-4a-5)/(a-2)+(2a^2-8a 求(2a平方+3a+2)/(a+1)-(a平方-4a-5)/(a+2)-(3a平方-4a-5)/(a-2)+(2a平方a