Question

va rog 3 dau coroana​

Answer 1

Răspuns:

10 la -1= 1/10; radical 5 / 1/10 = radical 5 x10

radical 80 = radical 4*4*5 = 4 radical 5

radical5=r5 (prescurtare)

a=10*r 5-10/r 5+4*r5

a=14*r5-10/r5 (inmultim fractia cu r5/r5)

a=14*r5-10*r5/r5*r5

a=14*r5-10*r5/5(aducem la celasi numitor-5)

a=(70*r5-10*r5)/5

a=60*r5/5

a=12*r5

b=

1/2+1/3+1/6 = (aducem la celasi numitor 6)

3/6+2/6+1/6 = 6/6 = 1

b=9*r10

aratati ca a<b

a= 12*r5; b=9*r10, adica b=9*r5*r2

facem a/b; daca rezultatul este subunitar inseamna ca a<b

12*r5 / 9*r5*r2 = 12/9*r2 = 4/3*r2 ; radical 2 = 1,41...; 3*1.41 >4; inseamna ca a <b

Explicație pas cu pas: