Question

gia tri cua tong a+b+c biet a+b=10 ; a+c=25;b+c=25

Answer 1

Ta có

 a+c =b+c =25=> a =b mà a+b =10 => a =b =5

a+c =25  => a+c+b =25+5 =30

Vậy a+b+c =30

Answer 2

a+b=10

a+c=25

b+c=25

=> a+b+a+c+b+c=10+25+25

hay a+a+b+b+c+c=60

=> 2.(a+b+c)=60

=> a+b+c=60:2

Vậy a+b+c=30.

Answer 3

Ta có:

(a+b)+(a+c)+(b+c)=10+25+25=60

=>2a+2b+2c=60

=>2(a+b+c)=60

=>a+b+c=30

 

Answer 4

êrererere

Answer 5

chịch khỏe vào

Answer 6

ai chich ban oi