问题补充说明:(1)a²-16,(2)(a+b)²-1(3)-4m²+25n²(4)169(a+b)²-121(a-b)²
(1)a²-16
=(a+4)(a-4)
(2)(a+b)²-1
=(a+b+1)(a+b-1)
(3)-4m²+25n²
=25n²-4m²
=(5n+2m)(5n-2m)
(4)169(360问答a+b)²-121(a-b)²
=[三岩般志教略金顺13(a+b)+11(a-b)][13(a+b)-11(a-b)]
=(13a+13b+11a-11b)(13a+13行这穿急米控常现肉表b-11a+11b)
=费影(24a+2b)(军那武2a+24b)
=4(12a+b)(a几烧+12b)