(3a-1)(2a+3)-(6a-5)(a-4)先化简再求值其中a=-1
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(3a-1)(2a+3)-(6a-5)(a-4)先化简再求值其中a=-1
(3a-1)(2a+3)-(6a-5)(a-4)先化简再求值其中a=-1
(3a-1)(2a+3)-(6a-5)(a-4)先化简再求值其中a=-1
原式=(6a²+9a-2a-3)-(6a²-24a-5a+20)
=6a²+7a-3-6a²+29a-20
=36a-23
=36×(-1)-23
=-59
a+a+1+a+2+a+3+a+4+a+5+a+6+a+7.+a+2013+a+2014=?
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)=?
(通分) a/a^a^a+3a+2 ,a/a^a+2a+1 ,-1/3a+6
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)+..
比较a^6+a^4+a^2+1与a^5+a^3+a的大小
a-2a+3a-4a+5a-6a+7a-8a+9a-10a+11a.+99a-100a=
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