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Cristianu03
a fost răspuns

aflati x, y, z daca x/0,3=10y/4, y/4=3z/5 si: a) x+y+3z=72 b) x-z=72 c) y+3z=90

Răspuns :

GabrielP
x = 3y/4 y = 12z/5 
=> c) 12z/5 + 3z = 90 <=> 27z/5 = 90 <=> z = (90*5)/27 = 450/27
=> b) x - 450/27 = 72 <=> x = 72 +450/27
=> a) 72 + y+ (450/27)*3 = 72 <=> y = - 450/9 <=> y = -50

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