Question

Problema 9 si 10 va rog mult dau coroana

Answer 1

9)
ortodocsi: 70%din500=70/100*500=350 persoane
catolici: 20%din 500= 20/100*500=100 persoane
alte religii: 10%din500=10/100*500=50 persoane
10)
a)
(3/7-1/4)/15=(4^3:2^5)/x-2
(3*4-7/28)/15=(2^6:2^5)/x-2
(5/28)/15=2/x-2
5/28/15=5/28:15=5/28*1/15=5/28*15=1/28*3=1/84
1/84=2/x-2
Inmultim cu 84(x-2) si obtinem:
x-2=2*84
x-2=168
x=170
b)( 3^2012+3^2011)/(3^2011+3^2010)=3^2011(3+1)/3^2010(3+1)=3
5 1/3 * 3 1/4 - (6 5/11)^0= (5*3+1)/3 * (3*4+1)/4-1=16/3 * 13/4 -1= 4*13/3-1=49/3
Obtinem:
3=49/3/4x
3=49/3:4x
3=49/3*1/4x
3=49/3*4x
3=49/12x
36x=49
x=49/36
c)
x/600=1*2+2*3+....+2010*2011/5*10+10*15+...+10050*10055

x/600=1*2+2*3+...+2010*2011/5(1*2+2*3+...+2010+2011)
Observam ca 1*2+2*3+...+2010*2011 se simplifica si obtinem:
x/600=1/5
x=120