9843 : x = 405 (dư 123)

=(9843-123):405

=9720:405

=24

a: =>21x=42

hay x=2

a: =>21x=42

hay x=2

Bài 2: 

a: =>21x=42

hay x=2

x=50343-123) :405

x=50220 :405

x=124

x=(50343-123):405
x=50220:405
x=124

x=50343-123) :405

x=50220 :405

x=124

x= 124 nha

HT

a: =>21y=105

hay y=5

b: =>50343=405x+123

=>405x=50220

hay x=124

a: =>x*21=3885:37=105

=>x=105:21=5

b: 50343:x=405 dư 123

=>x=(50343-123)/405=124

a, 3885 : (X x 21) = 37
=> 21X = 3885/37
=> 21X = 105
=> X = 5
b, 50343 : X = 405 (dư 123)
=> X = 50343 : 405 + 123
=> X = 33386/135

a) \(3885:\left(x\times21\right)=37\)

\(x\times21=3885:37\)

\(x\times21=105\)

\(x=105:21=5\)

b) \(50343:x=405\)(dư 123)

=> \(405\times x+123=50343\)

\(405\times x=50343-123\)

\(405\times x=50220\)

\(x=50220:405=124\)

\(x\) : 234 = 405 (dư 123)

\(x\)         = 405 x 234 + 123

\(x\)        = 94 770 + 123

\(x\)       =  94 893 

X : 234 = 405 ( dư 123 )

( X - 123 ) : 234 = 405

X - 123              = 405 x 234

X - 123              = 94 770

X                       = 94 770 + 123

X                       = 94 893

Vậy X = 94 893      

x : 234 = 405 ( dư 123 )

x : 234 = 405 + 123 

x : 234 = 528 

x          = 528 x 234 

x          = 123552