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a fost răspuns

axb=90
b=cx3
c=d:10
d-e=250
e:10=5

Răspuns :

Coco81
e=5x10=50
d=250+50=300
c=300/10=30
b=30x3=90
a=90/90=1

Romana39
e:10=5 => x =50
d -e =250 d-50=250 =>d=300
c =d:10 C =300:10 => c =30
b =c ori 3 b = 30 ori 3 => b=90
a ori b =90 a ori 90=90 => a= 1