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aflati x din ec 0,0(x) +0,1(x)=0,2(7)

Răspuns :

x/90+x-1/90=25/90
x+x-1=25
2x=25+1
2x=26
x=26/2
x=13
0.0(x)+0.1(x)=0.2(7)<=>x/90+(x-1)/90=25/90
x/90+(x-1)/90=5/18
x/90+x/90-1/90=5/18
x/45-1/90=5/18
x/45=5/18+1/90
x/45=13/45
x=(45*13)/45
x=13