Question

Determinati x din proportiile a) 5/1/2+1/3=x/12 b) 0,(3)/0,3(8)=x-1/1,1(6)
DAU 20 DE PUNCTE

Answer 1

a)
5/1/2=5/1*1/2=5/2
5/2+1/3=(15+2)/6=17/6
17/6=x/12
34/12=x/12
x=34
b)0,(3)/0,3(8)=(x-1)/1,1(6)
0,(3)=3/9=1/3
0,3(8)=(38-3)/90=35/90=7/18
1,1(6)=(116-11)/90=105/90=21/18=7/6
(1/3)/(7/18)=(x-1)/(7/6)
1/3*18/7=(x-1)*6/7
6/7=6(x-1)/7
6=6(x-1)
1=x-1
x=2