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Determinati nr a.b.c.d.e,stiind ca a/4=b/7=c/5=d/3=e/10 si a+b+c+d+e=145.

Răspuns :

a/4=b/7=c/5=d/3=e/10= a+b+c+d+e  /  4+7+5+3+10 = 145/29 = 5
a=4*5=20
b=7*5=35
c=5*5=25
d=3*5=15
e=10*5=50
k constanta de proporționalitate
a/4=b/7=c/5=d/3=e/10=k
a=4k
b=7k
c=5k
e=10k
d=3k

adunând
4k+7k+5k+3k+10k=145
29k=145
k=5
a=20
b=35
c=25
d=15
e=50