4(a+2)^2-9(a-1)^2
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4(a+2)^2-9(a-1)^24(a+2)^2-9(a-1)^24(a+2)^2-9(a-1)^24(a+2)^2-9(a-1)^2=[2(a+2)+3(a-1)][2(a+2)-3(a-1)]=
4(a+2)^2-9(a-1)^2
4(a+2)^2-9(a-1)^2
4(a+2)^2-9(a-1)^2
4(a+2)^2-9(a-1)^2
=[2(a+2)+3(a-1)][2(a+2)-3(a-1)]
=(2a+4+3a-3)(2a+4-3a+3)
=(5a+1)(-a+7)
=-(5a+1)(a-7)
4(a+2)²-9(a-1)²
=[2(a+2)-3(a-1)][2(a+2) +3(a-1)]
=(2a+4-3a+3)(2a+2+3a-1)
=(7-a)(5a+1)
a(a-1)(a-2)(a-3)(a-4)因式分解
【1】a+a=a×a a= [ ]【2】a×a=a÷a a=[ ]【3】a×a=a-a a=[ ] [4]a-a=a+a a=[ ]
计算[(a-1)/a*a-4*a+4]-[(a+2)/(a*a-2*a*a)]-4/a
a+a+1+a+2+a+3+a+4+a+5+a+6+a+7.+a+2013+a+2014=?
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)
幂的计算题1、a×a^2×a^3×a^4×a^52、a+2a+3a+4a+a×a^2×a^3×a^4
a-2a+3a-4a+5a-6a+7a-8a+9a-10a+11a.+99a-100a=
a/a^2-4 a-1/a-2 a+2/a^2-4a+4
[(a/a-2)-(a/a+2)]÷4a/2-a,其中a=-1/2
[a^2-4/(a-3)(a+2)+(a+2)/a-3]除以a+1/a-3
(1-16a×a×a×a)÷(4a×a+1)÷(2a+1)²
(1-16a×a×a×a)÷(4a×a+1)÷(2a+1)
(a+1/a方-a+4/1-a方)/a方+2a-3/a+3
[a-a/(a+1)]÷(a²-2a)/(a²-4)×(a+1)/(a²+4a+4)
a=-1 求a-2a+3a-4a+5a-6a+...+99a-100a
(a+4)(2a+1)(a-3)
已知a^2-3a+1=0,求a+1/a,a^2+1/a^2,a^2-1/a^2,a^3+1/a^3,4a^2-9a-2+9/(1+a^2)
化简(a/a-2-a/a+2)×4-a/a(a/a-2-a/a+2)×4-a/a