【9a+4b】²-【3a+b】²若a+b=3,求a²-b²+6b的值平方差因式分解
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![【9a+4b】²-【3a+b】²若a+b=3,求a²-b²+6b的值平方差因式分解](/uploads/image/z/1088496-0-6.jpg?t=%E3%80%909a%2B4b%E3%80%91%26%23178%3B-%E3%80%903a%2Bb%E3%80%91%26%23178%3B%E8%8B%A5a%2Bb%3D3%2C%E6%B1%82a%26%23178%3B-b%26%23178%3B%2B6b%E7%9A%84%E5%80%BC%E5%B9%B3%E6%96%B9%E5%B7%AE%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3)
【9a+4b】²-【3a+b】²若a+b=3,求a²-b²+6b的值平方差因式分解
【9a+4b】²-【3a+b】²
若a+b=3,求a²-b²+6b的值
平方差因式分解
【9a+4b】²-【3a+b】²若a+b=3,求a²-b²+6b的值平方差因式分解
a²-b²+6b
=(a+b)(a-b)+6b
=3(a-b)+6b
=3a+3b
=3(a+b)
=3×3
=9
给出完整的题目吧,这个看不清楚