Question

gasiti a,b,c,stiind ca{a,b,c} sunt invers proportionale cu {0,5;0,(3);0,1(6)},iar a+2c=70

Answer 1

a*5/10=b*3/9=c*15/90 =k      0,1(6)=(16-1)/90            a+2c=70
a*5/10=k ⇒a=k*10:5=2k
b*3/9=k ⇒b=3k
c3*15/90=k⇒c=6k

2k+2*(6k)=70
2k+12k=70
14k=70
k=70:14=5
a=5*2=10
b=5*3=15
c=5*6=30