分解因式 :9a²-3a﹙5a-3b﹚+﹙5a-3b﹚²
题目
分解因式 :9a²-3a﹙5a-3b﹚+﹙5a-3b﹚²
答案
9a²-3a﹙5a-3b﹚+﹙5a-3b﹚²
=9a²-15a²+9ab+25a²-30ab+9b²
=19a²+9b²-21ab
.
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