(2√5-4√2)·(2√2+√5) =
(√6-2√3)² =
To są wzory skróconego mnozenia!
(2√5-4√2)·(2√2+√5) =2(√5-2√2)(√5+2√2)=2(5-8)=-6
(√6-2√3)² =6-4√(18)+12=6-12√2+12=18-12√2
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(2√5-4√2)·(2√2+√5) =2(√5-2√2)(√5+2√2)=2(5-8)=-6
(√6-2√3)² =6-4√(18)+12=6-12√2+12=18-12√2