a x 6 + a x 3 + a = 550
a x 6 + a x 3 + a x 1 = 550
a x ( 3 + 6 + 1 ) = 550
a x 10 = 550
a = 550 : 10
a = 55
Vậy a = 55
a x 6 + a x 3 + a = 550
a x ( 6 + 3 + 1 ) = 550
a x 10 = 550
a x = 550 : 10
a x = 55
a x 6 + a x 3 + a = 550
a x 6 + a x 3 + a x 1 = 550
a x ( 6 + 3 + 1 ) = 550
a x 10 = 550
a = 550 : 10
a = 55
a x 6+ a x 3 +a =550
a x (6+3+1)=550
a x 10 =550
a=550:10
a=55
k mk nha lê hồng anh
a x 6 + a x 3 + a = 550
a x 6 + a x 3 + a x 1 = 550
a x ( 6 + 3 + 1 ) = 550
a x 10 = 550
a = 550 : 10
a = 55
k mk nha bạn