(a^2-4/a^-4a+4-1/a-2)÷a+1/a+2
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(a^2-4/a^-4a+4-1/a-2)÷a+1/a+2(a^2-4/a^-4a+4-1/a-2)÷a+1/a+2(a^2-4/a^-4a+4-1/a-2)÷a+1/a+2[(a²-4)/
(a^2-4/a^-4a+4-1/a-2)÷a+1/a+2
(a^2-4/a^-4a+4-1/a-2)÷a+1/a+2
(a^2-4/a^-4a+4-1/a-2)÷a+1/a+2
[(a²-4)/(a²-4a+4)-1/(a-2)]÷(a+1)/(a+2)
=[(a+2)(a-2)/(a-2)²-1/(a-2)]×(a+2)/(a+1)
=[(a+2)/(a-2)-1/(a-2)]×(a+2)/(a+1)
=(a+2-1)/(a-2)×(a+2)/(a+1)
=(a+1)/(a-2)×(a+2)/(a+1)
=(a+2)/(a-2)
原式=[(a+2)(a-2)/(a-2)²-1/(a-2)]×(a+2)/(a+1)
=[(a+2)/(a-2)-1/(a-2)]×(a+2)/(a+1)
=(a+2-1)/(a-2)×(a+2)/(a+1)
=(a+1)/(a-2)×(a+2)/(a+1)
=(a+2)/(a-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
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