Найдите значение выражения: 1) (√3+5)(√3-5), 2) (√5-3)^2 3) а) √7,8; б) 2√1,9;. Created by gwellhuahwi. matematika-ru

Найдите значение выражения: 1) (√3+5)(√3-5), 2) (√5-3)^2 3) а) √7,8; б) 2√1,9;...

malakasha 1) 3-25=-22
2)5- 6√5 +9 = 14-6√5
3 а) √78/10=√39/5=√39/√5=√195/5
б)2√19/10=2√19/√10=2√190/10= √190/5

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1) (√3+5)(√3-5) = 3-25=-22
2) (√5-3)^2 = 5-6√5+9=14-6√5
3) a) √7,8= √39:5=√39:√5=√195: 5 ≈2,79285
б) 2√1,9=2√(19/10)=2*(√19/√10)=2√19/√10=√190/5 ≈2,75681

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