Răspuns :
Răspuns:
25;5;1
Explicație pas cu pas:
5x=25y=125z=k
x=k/5
y=k/25
z=k/125
x+y+z=k(1/5+1/25+1/125)=k(25+5+1)/125=31k/125
31k/125=31
k/125=1
k=125
x=125/5=25
y=125/25=5
z=125/125=1
Răspuns: x=25; y=5; z=1
Explicație pas cu pas:
{x, y, z} i.p. {[tex] {5}^{1} [/tex], [tex] {5}^{2} [/tex], [tex] {5}^{3} [/tex]}=>{x, y, z} i.p. {5, 25, 125}=>5x=25y=125z=k (coeficient de proporționalitate
=>x=k÷5
=>y=k÷25
=>z=k÷125
x+y+z=31
k÷5+k÷25+k÷125=31/×125
25k+5k+k=3875
31k=3875
k=3875÷31
k=125
=>x=125÷5=25
=>y=125÷25=5
=>z=125÷125=1
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Verific: 25+5+1=30+1=31