a²-5a+6 a²+5a+4 a-3 ———— *—————÷—— a²-16 a²-4 a+4a²-16分之a²-5a+6乘a²-4分之a²+5a+4 除以a+4分之a-3
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![a²-5a+6 a²+5a+4 a-3 ———— *—————÷—— a²-16 a²-4 a+4a²-16分之a²-5a+6乘a²-4分之a²+5a+4 除以a+4分之a-3](/uploads/image/z/3176952-24-2.jpg?t=a%26%23178%3B-5a%2B6+a%26%23178%3B%2B5a%2B4+a-3+%E2%80%94%E2%80%94%E2%80%94%E2%80%94+%2A%E2%80%94%E2%80%94%E2%80%94%E2%80%94%E2%80%94%C3%B7%E2%80%94%E2%80%94+a%26%23178%3B-16+a%26%23178%3B-4+a%2B4a%26%23178%3B-16%E5%88%86%E4%B9%8Ba%26%23178%3B-5a%2B6%E4%B9%98a%26%23178%3B-4%E5%88%86%E4%B9%8Ba%26%23178%3B%2B5a%2B4+%E9%99%A4%E4%BB%A5a%2B4%E5%88%86%E4%B9%8Ba-3)
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a²-5a+6 a²+5a+4 a-3 ———— *—————÷—— a²-16 a²-4 a+4a²-16分之a²-5a+6乘a²-4分之a²+5a+4 除以a+4分之a-3
a²-5a+6 a²+5a+4 a-3 ———— *—————÷—— a²-16 a²-4 a+4
a²-16分之a²-5a+6乘a²-4分之a²+5a+4 除以a+4分之a-3
a²-5a+6 a²+5a+4 a-3 ———— *—————÷—— a²-16 a²-4 a+4a²-16分之a²-5a+6乘a²-4分之a²+5a+4 除以a+4分之a-3
a²-5a+6=(a-3)(a-2).
a²+5a+4=(a+4)(a+1).
看不懂题目,希望上两条对题目有用.