9a²-3a(5a-3b)+(5a-3b)²
=9a²-16a²+9ab+25a²-30ab+9b²
=18a²-21ab+9b²
=3(6a²-7ab+3b²)
=3(3a+b)(2a-3b)
分解因式 :9a²-3a﹙5a-3b﹚+﹙5a-3b﹚²
9a²-3a(5a-3b)+(5a-3b)²
=9a²-16a²+9ab+25a²-30ab+9b²
=18a²-21ab+9b²
=3(6a²-7ab+3b²)
=3(3a+b)(2a-3b)