se stie ca :a:b=3,b:2=c,a-b=40 Afla:3a-4b+5c


Răspuns :

a÷b=3
63÷21=3

b:2=c
40:2=20

a-b=40
136-96=40

afla:3a-4b+5c
340-48+500=792