=(√61a²-2b²)(√61a²+2b²)
=(√√61a-√2b)(√√61a-√2b)(√61a²+2b²)看看我的问题补充=(8a²-2b²)(8a²+2b²)=(2√2a-√2b)(2√2a-√2b)(8a²+2b²)=2（2a-b）(2a+b)(8a²+2b²)