(2a+5)(a^2-9)(2a-7)-91因式分解
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(2a+5)(a^2-9)(2a-7)-91因式分解
(2a+5)(a^2-9)(2a-7)-91因式分解
(2a+5)(a^2-9)(2a-7)-91因式分解
(2a+5)(a^2-9)(2a-7)-91
=(2a+5)(a-3)(a+3)(2a-7)-91
=(2a^2-a-15)(2a^2-a-21)-91
=(2a^2-a)^2-36(2a^2-a)+315-91
=(2a^2-a)^2-36(2a^2-a)+224
=(2a^2-a-8)(2a^2-a-28)
=(2a^2-a-8)(2a+7)(a-4)
参看http://zhidao.baidu.com/question/31688765.html
a-2a+3a-4a+5a-6a+7a-8a+9a-10a+11a.+99a-100a=
合并同类项:a-2a-3a+4a+5a-6a-7a+8a+9a-10a-11a+12a+……+2008a+2009a-2010a-2011a
a-2a-3a+4a+5a-6a-7a+8a+9a-10a-11a.+2008a+2009a-2010a-2011a如何合并同类项?
求和:1,a+a^2,a^3+a^4+a^5,a^6+a^7+a^8+a^9,···(a不等于0)
5(a*a*b-3*a*a*b)-2*(a*a*b-7*a*b*b)
2a-5a-7a=?
2a-5a-7a=
[-a*(-2a)^3*(-a)^5]^7
对任意自然数a,b,规定a#b=2*a+b,若a#2a#3a#4a#5a#6a#7a#8a#9a=3039,则A=()
观察下列的一组算式,找出其中的计算规律后,再填空:a+3a=4a=2^2a,a+3a+5a=9a=3^2a,a+3a+5a+7a=16a=4^2a,……,a+3a+5a+7a…+2005a=( )
化简a+2a-3a-4q+5a+6a-7a-8a+...2001a+2002a-2003a-2004a
(7a²-2/3a+5/9)×(-9a)
a(9a-2)+2a(2-a)=7a(a-2)-4
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)