4 Neither___right. A. answers are B. answers aren't C. answer is D. answer isn't 为什么选C

4 Neither___right. A. answers are B. answers aren't C. answer is D. answer isn't 为什么选C 化简（a/a-2-a/a+2)×4-a/a（a/a-2-a/a+2)×4-a/a a^2-4a 4a-1/a a-2a+3a-4a+5a-6a+...+99a-100a 化简; a-2a+3a-4a+5a-6a+``````-2006a+2007a. (a+3a+5a+...+2009a)-(2a+4a+6a+...+2008a)= (a+3a+5a+.+2009a)-(2a+4a+6a+.2008a) 计算（a+3a+5a+...+2009a)-(2a+4a+6a+...+2010a) (a+3a+5a+...+2013a)-(2a+4a+6a+...+2012a)= 化简：a-2a+3a-4a+5a-6a+.+2010a+2011a. 计算(a+3a+5a+.+2003a)-(2a+4a+6a+...+2004a) (a+3a+5a+.+2003a)-(2a+4a+6a+.+2004a) 计算;(a^3)^4+a^10×a^2-a×a^2-a*a^3*a^8 （a+3a+5a...+2009a)-(2a+4a+6a+...+2010a)=? a(a-1)(a-2)(a-3)(a-4)因式分解 【1】a+a=a×a a= [ ]【2】a×a=a÷a a=[ ]【3】a×a=a－a a=[ ] [4]a－a=a＋a a=[ ] 计算[(a-1)/a*a-4*a+4]-[(a+2)/(a*a-2*a*a)]-4/a