a) x + 1234 = 6789
x = 6789 - 1234
x = 5555
b) x - 1478 = 1236
x = 1236 + 1478
x = 2714
c) x . 6 + 123 : 3 = 59
x . 6 + 41 = 59
x . 6 = 59 - 41
x . 6 = 18
x = 18 : 6
x = 3
ung hộ mjk nha các bn
a)x+1234=6789
x =6789-1234
x =5555
b)x-1478 =1236
x =1236+1478
x =2714
c)x.6+123:3=59
x.6+123 =59x3
x.6+123 =177
x.6 =177-123
x.6 =54
x =54:6
x =9
x + 1234 = 6789
x = 6789 - 1234
x = 5555
x - 1478 = 1236
x = 1236 + 1478
x = 2714
x x 6 + 123 : 3 = 59
x x 6 + 41 = 59
x x 6 = 59 - 41
x x 6 = 18
x = 18 : 6
x = 3