(a^2-1)*[2a^2-3a+5/a^2-1 -(2a/1-a) - 4/1+a]写错了。是(a^2-1)*[2a^2-3a+5/a^2-1 -(1-2a/1-a) - 4/1+a]

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(a^2-1)*[2a^2-3a+5/a^2-1 -(2a/1-a) - 4/1+a]写错了。是(a^2-1)*[2a^2-3a+5/a^2-1 -(1-2a/1-a) - 4/1+a]
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(a^2-1)*[2a^2-3a+5/a^2-1 -(2a/1-a) - 4/1+a]写错了。是(a^2-1)*[2a^2-3a+5/a^2-1 -(1-2a/1-a) - 4/1+a]
(a^2-1)*[2a^2-3a+5/a^2-1 -(2a/1-a) - 4/1+a]
写错了。是(a^2-1)*[2a^2-3a+5/a^2-1 -(1-2a/1-a) - 4/1+a]

(a^2-1)*[2a^2-3a+5/a^2-1 -(2a/1-a) - 4/1+a]写错了。是(a^2-1)*[2a^2-3a+5/a^2-1 -(1-2a/1-a) - 4/1+a]
(a^2-1)*[2a^2-3a+5/a^2-1 -(2a/1-a) - 4/1+a]
=(a^2-1)*[(2a^2-3a+5)/(a^2-1) -(1-2a/(1-a) - 4/(1+a)]
=(a^2-1)*(2a^2-3a+5)/(a^2-1) -(a^2-1)*(1-2a)/(1-a) - (a^2-1)*4/(1+a)
=(2a^2-3a+5) -(a-1)(a+1)*(1-2a)/(1-a) - (a-1)(a+1)*4/(1+a)
=(2a^2-3a+5) +(a-1)(a+1)*(1-2a)/(a-1) -4 (a-1)
=(2a^2-3a+5) +(1-2a)(a+1)-4 (a-1)
=2a^2-3a+5 +1+a-2a^2-2a-4a+4
=2a^2-2a^2+a-2a-3a-4a+5 +1+4
=-8a+10

2a/1-a) 你是不是写错了？

原式=(a+1)(a-1)[(2a²-3a+5)/(a+1)(a-1)+2a/(a-1)-4/(a+1)]
=(a+1)(a-1)(2a²-3a+5)/(a+1)(a-1)+(a+1)(a-1)*2a/(a-1)-(a+1)(a-1)*4/(a+1)
=(2a²-3a+5)+2a(a+1)-4(a-1)
=2a²-3a+5+2a²+2a-4a+4
=4a²-5a+9

a+a+1+a+2+a+3+a+4+a+5+a+6+a+7.+a+2013+a+2014=? (a 1)(a 2)(a 3)(a (a+2)(a+1)-a(a-3) a=-1 求a-2a+3a-4a+5a-6a+...+99a-100a 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) （a+3a+5a...+2009a)-(2a+4a+6a+...+2010a)=? 5a^-〔a^-2a-2(a^-3a)] a(a-1)(a-2)(a-3)(a-4)因式分解 化简 3a-[5a-(a+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=[ ]