先化简:(a-2)/(a^2-4)+1/(a+2),化简后请你为a选择一个适当的数代入求值.
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先化简:(a-2)/(a^2-4)+1/(a+2),化简后请你为a选择一个适当的数代入求值.
先化简:(a-2)/(a^2-4)+1/(a+2),化简后请你为a选择一个适当的数代入求值.
先化简:(a-2)/(a^2-4)+1/(a+2),化简后请你为a选择一个适当的数代入求值.
原式=(a-2)/(2(a-2))+1/(a+2)=1/2+1/(a+2) (a不等于2且a不等于-2)
a=3时,原式=1/2+1/(3+2)=5/10+2/10=7/10
原式=(a-2)/[(a+2)(a-2)]+1/(a+2)=1/(a+2)+1/(a+2)=2/(a+2)
当a=0时,原式=(-2)/(-4)+1/(2=1/2+1/2=2/2=1
(a-2)/(a^2-4)+1/(a+2)=(a-2)/((a-2)(a+2))+1/(a+2)=1/(a+2)+1/(a+2)=2/(a+2)
当a=2时,原式=1/2
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=?
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-1/(a+1)-4,1-a/2-4a+2a 先化简 再通分 .
先化简,再求值:(a-1)/(a+2)*(a²-4)/(a²-2a+1)÷1/(a²-1),其中a满足a²-a=0
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)
先化简,再求值[(a^3+2a^2+4a)/(a-2)(a^2+2a+4)]-10/(a^2+a-6)除以[1-21/(a^2-4)]*(a+3)/(a-2),其中a=1/2
先化简,再求值[(a^3+2a^2+4a)/(a-2)(a^2+2a+4)]-10/(a^2+a-6)除以[1- 21/(a^2-4)]*(a+3)/(a-2),其中a=1/2