1)∜(6+√20) ∙∜(6-√20) =∜((6+√20)(6-√20) )=∜(36-20)=∜16=2 2)∜(4+√15) ∙∜(4-√15) =1
3)(√14-3√2)2+6√28 =14-6√28+18+6√28=14+18=32
(√14-3√2)^2=〖√14〗^2-2*√14*3√2+(3√2)^2=14-6√28+18
4) (11+√21)/(11-√21)+(11-√21)/(11+√21)=((11+√21)(11+√21)+(11-√21)(11-√21))/(11-√21)(11+√21) =(121+21+121+21)/(11-√21)(11+√21) =284/(121-21)=284/100=2,84
5) 1/(11-2√30)-1/(11+2√30)=
очень

malvinka011    2   26.11.2020 02:16    0