169（a+b）²–121（a–b）²因式分解

169（a+b）²–121（a–b）²因式分解
169（a+b）²–121（a–b）²因式分解

169（a+b）²–121（a–b）²因式分解
=(13a+13b)²-(11a-11b)²
=[(13a+13)-(11a-11b)]
[(13a+13b)+(11a-11b)]
=(2a+24v)(24a+2b)
=4(a+12b)(12a+b)

48a平方+580ab+290b平方