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Cine mă ajuta si pe mine la ex 10 dau coroana

Răspuns :

a/9/17=b/10/8=c/9/85=d/3/25=k
a=9k/17
b=10k/8
c=9k/85
d=3k/25
a+b+c+d=3409
9k/17+10k/8+9k/85+3k/25=3409
k=1700
a=900
b=2125
c=180
d=204