a ) x : 8 = 64
x = 64 : 8
x = 8
b ) x : 9 = 81
x = 81 : 9
x = 9
X : 8 = 64
X = 64 * 8
X = 512
b, X : 9 = 81
X = 81 * 9
X = 729
a) x : 8 = 64
x = 64 : 8
x = 8
b) x : 9 = 81
x = 81 : 9
x = 9
x:8=64
x=64x8
x=522
Vậy x=522
x:9=81
x=81x9
x=729
Vậy x=729
a) x:8=64
x=64x8
x=512
b) x:9=81
x=81x9
x=729