分解因式：9（a-b)²-25(a+b)²9(a-b)^2-25(a+b)^2 =[3(a-b)]^2-[5(a+b)]^2 =(3a-3b)^2-(5a+5b)^2 =[(3a-3b)+(5a+5b)][(3a-3b)-(5a+5b)] =(3a-3b+5a+5b)(3a-3b-5a-5b) =(8a+2b)(-2a-8b) =-(8a+2b)(2a+8b) =-4(4a+b)(a+4b)-(8a+2b)(2a+8b) =-4(4a+b)(a+4b)
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/20 21:07:49
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