(√2+√3-√5)(√2-√3+√5)= √2(√2-√3+√5) +√3(√2-√3+√5) -√5(√2-√3+√5)= 2 -√6+√10+√6 -3 +√15 -√10+√15-5= 2 -3-5-√6+√6+√10-√10+√15+√15= -6 +2√15
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(√2+√3-√5)(√2-√3+√5)
= √2(√2-√3+√5) +√3(√2-√3+√5) -√5(√2-√3+√5)
= 2 -√6+√10+√6 -3 +√15 -√10+√15-5
= 2 -3-5-√6+√6+√10-√10+√15+√15
= -6 +2√15