Question

utilizand propietatile inmultiriinumerelor naturale calculati: a) a, daca ab +ac=42 si b + c= 21   b) a,daca ab +ac+a = 176 si b +c =10

Answer 1

a) ab+ac=42
factor comun:
a(b+c)=42
a+b il stim, deci inlocuim:
a x 21=42
a= 2

b)ab+ac+a=176
a(b+c+1)=176
a(10+1)=176
a x11=176
a=16

Answer 2

A) A(B + C) = 42
A * 21 = 42
A = 42 : 21
A = 2
B) A(B + C) + A = 176
A * 10 + A = 176
11A = 176
A = 176 : 11
A = 16