Question

Ex . 11 si 15 va rog ... dau coroana

Answer 1

a) 4x7+4x11+4x22=
= 4x(7+11+22)
= 4x(18+22)
= 4x40
=  160
b) 5x30+5x25+5x15=
= 5x(30+25+15)
= 5x(55+15)
= 5x70
=350

Answer 2

11
a 1 . 4x(7+11+22)=161
   2 . 5x(30+25+15)=350
b.1 9x(50-35-12)=27
    2. 7x(45-32-7)=42
15 3+4=7 elevi p un rand
     7x4=28 de elevi in total 
             sau  
     3x4=12baeti 
     4x4=16 fete
     12+16=28elevi