Cine stie ??? DAU COROANA SI 15
PUNCTE


Cine Stie DAU COROANA SI 15 PUNCTE class=

Răspuns :

ab= (√2-1)(√2+1)=2-1=1

a²+b²=(a+b)²-2ab=(√2+1+√2-1)²-2*1=(2√2)²-2=8-2=6

m.a, = (√2-1+√2+1)/2=(2√2)/2=√2
m.g.=√ab=√1=1

(a;b) =(√2-1;√2+1)

numar rational
1∈Q si 1∈(a;b) pt ca 1>√2-1 pt ca 2>√2


numar irational
√2∈R\Q si √2∈(a;b) ptca √2-1<√2<√2+1