2ab分之a²-4乘以a²+4a+4分之4a²b+8ab
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![2ab分之a²-4乘以a²+4a+4分之4a²b+8ab](/uploads/image/z/4025921-41-1.jpg?t=2ab%E5%88%86%E4%B9%8Ba%26%23178%3B-4%E4%B9%98%E4%BB%A5a%26%23178%3B%2B4a%2B4%E5%88%86%E4%B9%8B4a%26%23178%3Bb%2B8ab)
2ab分之a²-4乘以a²+4a+4分之4a²b+8ab
2ab分之a²-4乘以a²+4a+4分之4a²b+8ab
2ab分之a²-4乘以a²+4a+4分之4a²b+8ab
(a^2-4)/2ab*(4a^2b+8ab)/(a^2+4a+4)
=(a+2)(a-2)/2ab*4ab(a+2)/(a+2)^2
=2(a-2)
(a^2-4)/(2ab)×(4a^2b+8ab)/(a^2+4a+4)
=(a+2)(a-2)/(2ab)×4ab(a+2)/(a+2)^2
=2(a-2)
=2a-4
2(a-2 )