(5a+?)(5a-?)=25a²-16b²
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(5a+?)(5a-?)=25a²-16b²(5a+?)(5a-?)=25a²-16b²(5a+?)(5a-?)=25a²-16b²√16b
(5a+?)(5a-?)=25a²-16b²
(5a+?)(5a-?)=25a²-16b²
(5a+?)(5a-?)=25a²-16b²
√16b²=4b
所以(5a+4b)(5a-4b)=25a²-16b²