bài 1
a)
x : 13 = 41
x = 41 x 13
x = 533
b) 1428 : x = 14
x = 1428 : 14
x = 102
c) 4x : 17 = 0
4x = 0 x 17
4x = 0
x = 0 : 4
x = 0
d) 7x - 8 = 713
7x = 713+ 8
7x = 721
x = 721 : 7
x = 103
e) 8 [ x - 3 ] = 0
x - 3 = 0 : 8
x - 3 = 0
x = 0 + 3
x = 3
x =