1.X :28584 +1729 = 1735
2.X x 74 +57 x X =32604
3. 17856 :(205 - X) =48
4.Y :28=467 (DƯ 15)
5.668 x a - 66 x 45 =6680
6.X : 48 : 25 = 374
7.134260 :X = 1320:54
8.(2043 - X) x 84=132552
9.4768+85 x X =25763
10.43575 -75 x X=4275
11. 3257+ 25286 : X =3304
12. 3132 - 19832 :X=3058
13. 327 x (126+X)=67035
14.10208 : (108 +X)=58
15.4057 +(X : 38) =20395
16. 21683 - (X : 47)=4857
17.7649 + X x 54 = 33137
18.35320 - X x 72 =13072
20. 75 x (X +157)=24450
21.14700 : (X+47)=84
22.12925:X + 3247 = 3522
23. 17658: X - 178 = 149
24.X:125 x 64=4608
25.X:48 :25=374
26. X x 124+ 5276=48304
28.X x 45 - 3209 = 13036
29. 1200 : 24 - (17-x)=36
30.9 x ( x +5)=729
31.55 x Y +46 x Y - Y =3600
32. 285 x Y+Y x 115 =800
33.723 x X - 224 x X = 1000
34. X x 16 +54 x X =700
35. x/12=156/504
36.50/75 = x-12/81
37. yx7x8/12x56 = 3/4
38.9/24=a/56
39.94 : X=47/105
40.Y:84=106/84
41.678 x 91-678 x a=6780
42.75/x=5/3
43.3/x=x/27
44.Y x (233+327)=327x99+99x233
1.
$x:28584+1729=1735$
$x:28584=1735-1729=6$
$x=6\times 28584=171504$
2.
$x\times 74+x\times 57=32604$
$x\times (74+57)=32604$
$x\times 131=32604$
$x=32604:131=248,89$
3.
$17856:(205-x)=48$
$205-x=17856:48=372$
$x=205-372$ (số bé trừ số lớn lớp 5 chưa học, bạn xem lại nhé)
4.
$y:28=467$ dư 15
$y=28\times 467+15=13091$
5.
$668\times a-66\times 45=6680$
$668\times a-2970=6680$
$668\times a=6680+2970=9650$
$a=9650:668=14,45$
6.
$x:48:25=374$
$x=374\times 25\times 48=448800$