x + 7 = 89
x = 89 - 7
x = 82
x + 6 = 34
x = 34 - 6
x = 28
x + 8 = 89
x = 89 - 8
x = 81
x + 9 = 23
x = 23 - 9
x = 14
+) x+7=89
x= 89-7=82
vậy x=82
+) x+8=69
x=69-8=61
vậy x=61
+) x+6=34
x= 34-6=28
vậy x= 38
+ x+9=23
x= 23-9=14
vậy x=14
X + 7 = 89 X + 6 = 34 X + 8 = 69 X + 9 = 23
X = 89 - 7 X = 34 - 6 X = 69 - 8 X = 23 - 9
X = 82 X = 28 X = 61 X = 14
x + 7 = 89 x+ 6 = 34
x = 82 x= 28
x+8 = 69 x + 9 = 23
x =61 x = 14
x + 7 = 89 x + 8 = 69
x = 89 - 7 x = 69 - 8
x = 82 x = 61
x + 6 = 34 x + 9 = 23
x = 34 - 6 x = 23 - 9
x = 28 x = 14
X + 7 = 89 X + 6 = 34 X + 8 = 69 X + 9 =23
X = 89 -7 X = 34 - 6 X = 69 -8 X = 23 -9
X = 82 X = 28 X = 61 X = 14
A) X+7=89 B) X+6=34 C) X+8 = 69 D) X + 9 = 23
X=89-7 X=34-6 X=69-8 X=23-9
X=82 X=28 X=61 X=14
X + 7 = 89 X + 8 = 69
X = 89 - 7 X = 69 - 8
X = 82 X = 61
X + 6 = 34 X + 9 = 23
X = 34 - 6 X = 23 - 9
X = 28 X = 14
x + 7 = 89=>x = 89 ‐ 7
x = 82
x + 8 = 89=>x = 89 ‐ 8
x = 81
x +6 = 34 =>x = 34 ‐ 6
x = 28
x + 8 = 89=>x = 89 ‐ 8
x = 81
x + 9 = 23=>x = 23 ‐ 9
x = 14
TK MK NHA
82 + 7 = 89 , 61 + 8 = 69 ,28 + 6 = 34,14 + 9 = 23 nha
x = 89 - 7 x = 82 x= 34-6 x = 28 x= 69-8 x= 61 x= 23-9 x= 14