Răspunsuri

2014-10-03T17:09:11+03:00
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
2014-10-03T17:39:29+03:00
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