👤

ex 2,3..........,,,,,,,,,....

Ex 23 class=

Răspuns :

Problema 2 : r=5l
r-20=l+20=>r=l+40
l+40=5l=>40=5l-l=>l=40:4=>l=10 file are catea Luciei
r=5x10=50 file are cartea Ralucai 
Problema 3 : 
5X4=20
20X2=40
=>20+40=60