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Problema 3. va rooog

Problema 3 Va Rooog class=

Răspuns :

a/b=c/d
ad=bc
ad=4
5bc=5·4=20

b)ad=bc
ad=6
bc+4=6+4=10

c)ad=bc
bc=8
(4bc-1)/ 5ad=33/40

d)ad=bc
(10bc+8ad) / (10bc-8ad)=(10bc+8bc)/ (10bc-8bc)=18bc/2bc=9