化简:a²-4/a²+4a+4=__________ ; -b.b/2a÷1/a=_________
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化简:a²-4/a²+4a+4=__________;-b.b/2a÷1/a=_________化简:a²-4/a²+4a+4=__________;-b.b/
化简:a²-4/a²+4a+4=__________ ; -b.b/2a÷1/a=_________
化简:a²-4/a²+4a+4=__________ ; -b.b/2a÷1/a=_________
化简:a²-4/a²+4a+4=__________ ; -b.b/2a÷1/a=_________
a²-4/a²+4a+4
=(a+2)(a-2)/(a+2)²
=(a-2)/(a+2)
-b.b/2a÷1/a=-b²/2
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