Răspuns :
a/5 = 2/b <=> ab=5×2 <=> ab=10
din 5ab-10= 5×10-10= 50-10= 40
a/5=2/b=k=>a=5k,b=2k
5ab-10=5×5k×2k-10=
=50k-10|:10
k=5
a=5×5=25
b=2×5=10
5ab-10=5×25×10-10=1250-10=1240
a/5 = 2/b <=> ab=5×2 <=> ab=10
din 5ab-10= 5×10-10= 50-10= 40
a/5=2/b=k=>a=5k,b=2k
5ab-10=5×5k×2k-10=
=50k-10|:10
k=5
a=5×5=25
b=2×5=10
5ab-10=5×25×10-10=1250-10=1240