x : 13 = 41
x = 41 x 13
x = 533
8 . ( x - 3 ) = 0
x - 3 = 0 : 8
x - 3 = 0
x = 0 + 3
x = 3
x:13=81
x=81.13
x=1053
Vay x=1053
8.(x-3)=0
x-3 =0:8
x-3 =0
x =0+3
x=3
Vay x=3
x : 13 = 41
x = 41 x 13
x = 533
8 . ( x - 3 ) = 0
vì 8 khác 0 nên :
x - 3 = 0 : 8
x = 0 + 3
x = 3