9(a+b)²-25﹙a-b)
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/22 02:18:10
![9(a+b)²-25﹙a-b)](/uploads/image/z/6968492-44-2.jpg?t=9%EF%BC%88a%2Bb%EF%BC%89%26%23178%3B%EF%BC%8D25%EF%B9%99a%EF%BC%8Db%29)
9(a+b)²-25﹙a-b)
9(a+b)²-25﹙a-b)
9(a+b)²-25﹙a-b)
9(a+b)²-25(a-b)
=(3a+3b+5a-5b)(3a+3b-5a+5b)
=(8a-2b)(8b-2a)
=4(4a-b)(4b-a)
9(a+b)²-25﹙a-b)
=[3(a+b)]²-[5(a-b)]²
=[3(a+b)+5(a-b)][3(a+b)-5(a-b)]
=(8a-2b)(-2a+8b)
=4(4a-b)(4b-a)