Question

Tìm a biết a.10+a.90=1000

Answer 1

a . 10 + a . 90 = 1000

=> a . ( 90 + 10 ) = 1000

=> a . 100 = 1000

a = 1000 : 100

a = 10

Answer 2

a.10 +a.90 = 1000

a .( 10+90) =1000

a.100 =1000

a =  1000:100

a= 10

=> a = 10