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ac si bd,daca a pe b = c pe d =2 si axbxcxd=900

Răspuns :

a/b=c/d=2 => a/b=2 => a=2b ; c/d=2 => c=2d si a•b•c•d=900 <=> 2b•b•2d•d=900 => 4(bd)^2=900 => (bd)^2=900:4 => (bd)^2=225 => bd=15 .Acum aflam pe ac: a•b•c•d=900 |•4 <=> a•2b•c•2d=3600 <=> a•a•c•c=3600 <=> (ac)^2=3600 => ac=60