Question

Calculati media aritmetica a numerelor:
a)5/6 si 2/3
b)0,5 si 1/4
c)0,75 si 1,4
d)24;15;8;12;
e)0,25;0,45;2,4;1,2;
f)0,(3);1,(6);1,1(6)
Dau coroana!

Answer 1

a) (5/6 + 2/3):2 (amplifici 2/3 cu 2 ca aiba acelasi numitor) =(5/6+4/6):2=9/6:2=9/6 • 1/2=9/12=3/4

b) 0,5= 5/10
(5/10×1/4):2 (din nou aducem la acelasi numitor)= (20/40+10/40):2= 30/40:2=30/40 • 1/2= 30/80= 3/8

c) 0,75= 75/100
1,4= 14/10
(75/100+14/10):2= (75/100+140/100):2= 215/100:2= 215/100 • 1/2= 215/200=43/40
mi-a dat 43/40 fiindca am simplificat cu 5

d)(24+15+8+12):4= 59:4= 14,75

e)0,25= 25/100
0,45= 45/100
2,4= 24/10
1,2= 12/10
(25/100+45/100+24/10+12/10):4= (25/100+45/100+240/100+120/100):4= 430/100:4= 430/100 • 1/4= 430/400= 43/40

f) 0,(3)= 3/9
1,(6)=1 intreg si 6/9= 1•9+6/9= 15/9
1,1 (6)= 1 intreg si 16-6/90= 1 intreg si 10/90= 1•90+10/90= 100/90

(3/9+15/9+100/90):3= (30/90+150/90+100/90):3= 280/90:3= 280/90 • 1/3= 280/270= 28/27

Sper ca te-am ajutat!

Answer 2

primesc coroana ?
sper ca te-am ajutat!