化简:[(a-2)/(a²+2a)-(a-1)/(a²+4a+4)]÷(a-4)/(a+2)
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化简:[(a-2)/(a²+2a)-(a-1)/(a²+4a+4)]÷(a-4)/(a+2)
化简:[(a-2)/(a²+2a)-(a-1)/(a²+4a+4)]÷(a-4)/(a+2)
化简:[(a-2)/(a²+2a)-(a-1)/(a²+4a+4)]÷(a-4)/(a+2)
您好:
[(a-2)/(a²+2a)-(a-1)/(a²+4a+4)]÷(a-4)/(a+2)
=[(a-2)/a(a+2)-(a-1)/(a+2)²]÷(a-4)/(a+2)
=(a-2)/a(a-4)-(a-1)/(a+2)(a-4)
=[(a-2)(a-4)-a(a-1)]/(a+2)(a-4)
=(a²-6a+8-a²+a)/(a+2)(a-4)
=(-5a+8)/(a+2)(a-4)
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