(a^2-7a+6)(a^2-a-6)+56一定要用换元啊
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(a^2-7a+6)(a^2-a-6)+56一定要用换元啊
(a^2-7a+6)(a^2-a-6)+56
一定要用换元啊
(a^2-7a+6)(a^2-a-6)+56一定要用换元啊
=(a-1)(a-6)(a-3)(a+2)+56
=[(a-1)(a-3)][(a-6)(a+2)]+56
=[(a²-4a)+3][(a²-4a)-12]+56
令x=a²-4a
=(x+3)(x-12)+56
=x²-9x+20
=(x-4)(x-5)
=(a²-4a-4)(a²-4a-5)
=(a²-4a-4)(a-5)(a+1)
=(a-1)(a-6)(a-3)(a+2)+56
=[(a-1)(a-3)][(a-6)(a+2)]+56
=[(a²-4a)+3][(a²-4a)-12]+56
令x=a²-4a
=(x+3)(x-12)+56
=x²-9x+20
=(x-4)(x-5)
=(a²-4a-4)(a²-4a-5)
=(a²-4a-4)(a-5)(a+1)
a-2a+3a-4a+5a-6a+7a-8a+9a-10a+11a.+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)=?
合并同类项:a-2a-3a+4a+5a-6a-7a+8a+9a-10a-11a+12a+……+2008a+2009a-2010a-2011a
化简a+2a-3a-4q+5a+6a-7a-8a+...2001a+2002a-2003a-2004a
计算 8a-a^3+a^2+4a^3-a^2-7a-6
(通分) a/a^a^a+3a+2 ,a/a^a+2a+1 ,-1/3a+6
a+a+1+a+2+a+3+a+4+a+5+a+6+a+7.+a+2013+a+2014=?
a-2a-3a+4a+5a-6a-7a+8a+9a-10a-11a.+2008a+2009a-2010a-2011a如何合并同类项?
已知a^2+a+1=0,求1+a+a^2+a^3+a^4+a^5+a^6+a^7+a^8的值