👤

ajutatima va rog cu rezolvarile la 4,5, si 6 va rog frumos,multumesc


Ajutatima Va Rog Cu Rezolvarile La 45 Si 6 Va Rog Frumosmultumesc class=

Răspuns :

                                                  Ex 4

a=√(5+3√3)²=5+3√3                               b=I5-3√3I=3√3-5

 Media aritmetica = ( 5+3√3 + 3√3 - 5) / 2=6√3 / 2 = 3√3

Media geometrica = √{(3√3+5)(3√3-5)}=√(27-25)=√2
                                                  Ex 5

a) x /(2√3 + 3)= (2√3 -3) / √3

x√3=12-9=3        x=√3

b) √( 13 +√1296) / x = ( 3³-3²-3-3°) / √( 23+ √1681)

√(13+36)·√(23+41)=(27-9-3-1)·x

7·8=14x        x=56/14=4

                                                 Ex 6

a) {  [√3-1]/√2 - √2/(√3+1)} la 15= { (3-1-2) / (√2(√3+1) la 15 = (0/(√6+√2) la 15=0

b) 5/(√7-√2)+2/(3+√7)={ 5(3+√7)+2(√7-√2) } / { (√7-√2)(3+√7)}

=> {15+5√7+2√7-2√2} / { 3√7 + 7-3√2 - √14}={15+7√7-2√2} / { 7+3√7 -3√2 -√14}

c) √(√5(√5-√7)-√7(√5-√7)=√(√5-√7)²=√5-√7

d) { √(4+2√3)+√(4-2√3) }²=4+2√3+2√(16-12)+4-2√3=8+ 4=12