( X x 2 + 3 + 4 + 1 ) = 2130

X x 10    = 2130 

 X = 2130 : 10 

X = 213

Xx2+Xx3+Xx4+X=2130

Xx(2+3+4+1)      =2130

Xx10                 =2130

X                      =2130:10

X                      =213

đáp án 213

x=4105

a)x=1234

b)x3 là sao vậy

c)x=4105

Xx3+X=4936

Xx4=4936

X=4936:4

X=1234

Xx2+Xx3=3785

Xx5=3785

X=3785:5

X=757

\(X:5+1195=2016\)

\(X:5=812\)

\(X=\frac{812}{5}\)

X  x 3 + X x 2 + x  - 2389 = 3779

X x ( 3 + 2 + 1 ) = 3779 + 2389

X x 6 = 6162 

X = 6168 : 6 

X =1028

X x 3+ X x 2+ X-2389=3779

Xx(3+2+1)=3779+2389

Xx6=6168

X=6168:6=1028

X x 3 + X x 2 + X - 2389 = 3779

X x (3 + 2 + 1) = 3779 + 2389

X x 6 = 6168

X = 6168 : 6

X = 1028

x.2+x.3+x.4+x=2130

x.(2+3+4+1)=2130

x.10=2130

x=2130:10

x=213

`x xx 2 + x xx3+x xx4+x=2130`

`x xx(2+3+4+1)=2130`

`x xx 10=2130`

`x=2130:10=213`

B   = x x 3 + 1 + 1 − x x 2 − x + 1 + 1 x + 1 = x (x + 1)(x 2 − x + 1) + (1 − x)(x + 1) (x + 1)(x 2 − x + 1) + 1.(x 2 − x + 1) (x + 1)(x 2 − x + 1) = x + 1 − x 2 + x 2 − x + 1 (x + 1)(x 2 − x + 1) = 2 x 3 + 1

8x - 3x = 430

x( 8 - 3 ) = 430

5x = 430 

x = 430 : 5

x = 86

X x 2 + 85 + X x 3 = 195

X x (2 + 3)     = 195 - 85

X x 5             = 110

X                  = 110 : 5

X                  = 22

X x 2 + 85 + X x 3 = 195

X x 2 + X x 3 = 115

X x 5 = 115

X = 115 : 5

X = 23

X x 2 + 85 + X x 3 = 195 

X x 2 + X x 3 = 115 

X x 5 = 115 

X = 115 : 5 

X = 23 

k cho mình để đủ 220 nha

(Xx1)+(Xx2)+(Xx3)+(Xx4)=50

=>4xX+10=50

=>4xX=50-10

=>4xX=40

=>X=40:10

=>X=4

720: [X(2+3)]=6

X(2+3)=720/6=120

x.5=120

=>x=24 nha bn

720 : (Xx2+Xx3)=6

720  : (5xX) =6

X= 720 : 6 : 5

X=120 : 5 =24

720 : [ X ( 2 + 3) ]= 6

X( 2 + 3 ) = 120

=> X . 5 = 120

=> x = 24