Question

Am pus problemele astea de multe ori si nimeni nu m.a ajutat.Va rog mult,nu stiu sa le fac.Alegeti 2 ex si le faceti si primiti coroana.Promit

Answer 1

Răspuns:

BC=50cm

CD=32cm

AC=800cm

AD=240cm

Explicație pas cu pas:

EX15:AB^2=BC×BD=>30^2=BC×18=>900=BC-18=>BC=900÷18=>BC=50

CD=BC-BD=>CD=50-18=>CD=32

AC^2=BC×DC=>AC^2=50×32=>AC^2=1600=>AC=1600÷2=>AC=800

AD^2=AB×AC/BC=>AD^2=30×800/50=>AD^2=24000/50=>AD^2=480=>AD=480÷2=>AD=240