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pornind de la proportia x supra y = 5 supra 6 formati 5 proportii derivate

Răspuns :

x/y = 6/5
x+y/y = 6+5/5
x-y/y = 6-5/5
x/y+x = 6/5+6
x/y-x = 6/5-6
x/y = 6/5 = x+6/y+5