Question

Știind ca ab+ac=14 si a(b-2+c)=10 , sa se afle a si b+c?

Answer 1

a(b-2+c)=10
ab-2a+ac=10
ab+ac-2a=10
14-2a=10 => 2a=14-10=4 => a=4/2=2


ab+ac=14
2b+2c=14 |÷2
b+c=7

Answer 2

ab + ac = 14 si a ( b - 2 + c ) = 10

a × ( b - 2 + c ) = 10

a b - 2 a + a c = 10

ab + ac - 2 a = 10

14 - 2 a = 10

2 a = 14 - 10

a = 4 : 2

a = 2

___________

ab + ac = 14

a × ( b + c ) = 14

2 × ( b + c ) = 14

b + c = 14 : 2 ⇒ b + c = 7