Serban a lucrat in 5 zile cate 6 probleme/zi, iar alex in 5 zile cate 8 probleme/zi. Cate probleme au lucrat cei 2 copii in total. Rezolva in 2 moduri.
1. (5*6)+(5*8)= 70
Cum se rezolva in al 2-lea mod?

1
5*6=30
scz am gresit
5*6=30 5*8=40 30+40=70

Răspunsuri

2013-12-16T13:39:06+02:00