Question

Va rog, am nevoie de ajutor !!!

Answer 1

Răspuns:

a)  x= 77/32 ∈ Q

b ) x= 5/2∈Q

c ) x= 1/2 ∈ Q

Explicație pas cu pas:

 a ) √1 =1 , √25/16=5/4  ,√81/64 = 9/8

1+ 5/4: 9/8= 1+5/4· 9/8 = 1+ 45/32

aduci la acelasi numitor (32 ) ⇒ (32+45)/32 = 77/32 ∈ Q

b)

5/8 : ( 3- 11/4 ) = 5/8 : 1/4 = 5/8·4/1 = 20/8 = 10/4 = 5/2 ∈Q

c)  5/6 :√ 2+ 7/9 = 5/6 : 5/3 = 5/6 ·3/5 = 3/6 = 1/2∈Q