A=√9+4√2-√9-4√2 A=√5-2√6+√3+2√2

A=√9+4√2-√9-4√2
A=√5-2√6+√3+2√2
A=√13-4√3+√7-4√3
A=√5+2√6+√5-2√6
A=√24+8√5+√9-4√5
A=√15-6√6+√33-12√6
A=√6-4√2+√22-12√2
A=√17+12√2+√9+4√2
rút gọn