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determinati numerele a,b si c d.p cu numerele 0,(3);1,5;1,25 stiind ca 7a-b+3a =110

Răspuns :

a/0,(3)=b/1,5=c/1,25=k
a=0,(3)k=3/9·k=1/3k
b=1,5k=3/2·k=3k/2
c=1,25k=5/4·k=5k/4
inlocuim in relatie
7k/3-3k/2+15k/4=110 |·12
28k-18k+45k=110
55k=110 |:11
5k=10
k=2
a=2/3=0,(6)
b=3
c=5/2=2,5