(2a*a-4a+1)-( )=4a*a-8a+2
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(2a*a-4a+1)-()=4a*a-8a+2(2a*a-4a+1)-()=4a*a-8a+2(2a*a-4a+1)-()=4a*a-8a+2(2a*a-4a+1)-()=4a*a-8a+2,其实就
(2a*a-4a+1)-( )=4a*a-8a+2
(2a*a-4a+1)-( )=4a*a-8a+2
(2a*a-4a+1)-( )=4a*a-8a+2
(2a*a-4a+1)-( )=4a*a-8a+2,其实就是
(2a*a-4a+1)-( 4a*a-8a+2 )=2a²-4a+1-4a²+8a-2=-2a²+4a-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+a+1+a+2+a+3+a+4+a+5+a+6+a+7.+a+2013+a+2014=?
[(a/a-2)-(a/a+2)]÷4a/2-a,其中a=-1/2
a=-1 求a-2a+3a-4a+5a-6a+...+99a-100a
(a+3a+5a+...+2009a)-(2a+4a+6a+...+2008a)=
(a+3a+5a+...+2013a)-(2a+4a+6a+...+2012a)=
(a+3a+5a...+2009a)-(2a+4a+6a+...+2010a)=?
a(a-1)(a-2)(a-3)(a-4)因式分解
(a-2/a^2+2a-a-1/a^2+4a+4)除以a-4/a+2,其中a满足a^2+2a-1=0
先化简后,再求值:(a-2/a*a+2a-a-1/a*a+4a+4)/a-4/a+2其中a=根号2-1
计算[(a-1)/a*a-4*a+4]-[(a+2)/(a*a-2*a*a)]-4/a
化简后,求值:a×2a×3a×4a×5a×(a+2a+3a+4a+5a),其中a³=1/3
a+a^2+a^3+a^4+a^5+a^6...+a^n=a^n+1-a/a-1 (a-1)≠0
当a=1时,a-2a+3a-4a+5a…+99a-100a=
化简多项式a-2a+3a-4a+5a-...+99a-100a用下面方法解决 a-(a+b)+(a+2b)-(a+3b)+...-(a+101b)解法1:a-2a+3a-4a+5a-..+99a-100a =(a+3a+5a+..+99a)+(-2a-4a-6a-...-100a)=2500a-2550a=-50a解法2:a-2a+3a-4a+5a-...+99a-100a=(a-2a)+(3a-4a)+(5a-6a)+..
(2a*a-4a+1)-( )=4a*a-8a+2
a²-1/a²-2a + 4a-5/2a-a²=
a²-1/a²-2a + 4a-5/2a-a²=