Bài 1:
a/ 360 : { 3360 : (2000 -(120 + 2 . 2 . 50)}
= 360 : { 3360 : (2000 -(120 + 200)}
= 360 : { 3360 : (2000 - 320)}
= 360 : ( 3360 : 1680)
= 360 : 2 = 180
b/
$2^{120}$ : $2^{218}$ + $3^{798}$ : $3^{788}$ - $12^{45}$ : 12
= $2^{120-118}$ + $3^{798-788}$ -$12^{45-1}$
=$2^{2}$ + $3^{10}$ -$12^{44}$
c/-4+ 12+104 +(-12)
-4+ 12+104 - 12
=100
Bài 2:
a) 29x- 13= 45
29x =45+13
29x =58
x =58 : 29
x =2
b)(168-2x):7 = 24
168 - 2x = 24 . 7
168 - 2x = 168
2x = 168 : 168
2x = 1
x = 0,5
c/x : 8 và 15 < x < 60
x ∈ 0,8,16,24,32,40,48,56,....
15 < x > 60
x ∈ 16,24,32,40,48,56
@Kimtaehyung4
O2