#)Giải :

           \(71+65.4=\frac{x+140}{x}+260\)

\(\frac{x+140}{x}+260=71+65.4\)

\(\frac{x+140}{x}+260=71+260\)

             \(\frac{x+140}{x}=71\)

         \(\frac{x}{x}+\frac{140}{x}=71\)

           \(1+\frac{140}{x}=71\)

                   \(\frac{140}{x}=71-1\)

                   \(\frac{140}{x}=70\)

                          \(x=140:70\)

                          \(x=2\)

             #~Will~be~Pens~#

\(71+65.4=\frac{x+140}{x}+260\)

\(\Rightarrow\frac{x+140}{x}+260=71+65.4\)

\(\frac{x+140}{x}+260=331\)

\(\frac{x+140}{x}=331-260=71\)

\(\frac{x}{x}+\frac{140}{x}=71\)

\(1+\frac{140}{x}=71\)

\(\frac{140}{x}=71-1=70\)

\(x=\frac{140}{70}=2\)

Vậy x=2

\(71+65\text{ x }4=\frac{x+140}{x}+260\)

\(\frac{x+140}{x}+260=71+65\text{ x }4\)

\(\frac{x+140}{x}+260=71+260\)

\(\frac{x+140}{x}=71\)

\(71x=x+140\)

\(71x-x=140\)

\(70x=140\)

\(x=140\text{ : }70\)

\(x=2\)

hình như bn viết ngược 

                     bài giải

x + 140/x + 260=331

x nhân 2 + 140 =331-260=71

x nhân 2 =71 : 140 =0,50

      x= 0,50 : 2

      x=0,25

          hok tốt

\(71+65\) x 4 = \(\frac{x+140}{x+260}\)

=> 71 + 260 = \(\frac{x+140}{x+260}\)

=> \(331=\frac{x+140}{x+260}\)

=> \(331.\left(x+260\right)=x+140\)

=> \(331x+86060=x+140\)

=> \(331x-x=-86060+140\)

=>330x =- 85920

=> x = -2864/11

=> \(330x=-85920\)

ok nhưng tớ ko giải được like nha !

\(71+65\cdot4=\frac{x+140}{x}+260\)

\(\Rightarrow71+260=\frac{x}{x}+\frac{140}{x}+260\)

\(\Rightarrow71=1+\frac{140}{x}\)

\(\Rightarrow\frac{140}{x}=70\)

\(\Rightarrow x=2\)

71+65*4=x+140 +260

                   x

=>71+260=   x   +  140  +260

                     x          x 

=>71=1+   140   

                   x

=> 71-1 =    140   

                      x

=> 70=140:x

=>x=140:70=2

71 + 65 x 4 = x + 140/x + 260

331 = x/x + 140/x + 260

331 = 1 + 140/x + 260

=> 331 - 1  - 260 = 140/x

70 = 140/x

x = 140 : 70

x = 2

Để mình giải lần nữa cho:

     71 + 65 x 4 = \(\frac{x+140}{x}+260\)

     71 + 260    = \(\frac{x}{x}+\frac{140}{x}+260\)

     71             =  \(1+\frac{140}{x}\)

     \(71-1\)  = \(\frac{140}{x}\)

     70             = \(\frac{140}{x}\)

     x               = 140 : 70

     x               = 2

cho mk 1 cái l-i-k-e đi minh phương cái này mk giải đầu mà

\(71+65.4=\frac{x+140}{x}+260\)

\(71+260=\frac{x}{x}+\frac{140}{x}+260\)

=> \(1+\frac{140}{x}=71\)

=> \(\frac{140}{x}=71-1=70\)

=> \(\frac{140}{x}=\frac{140}{2}\)

=> x = 2

Vậy x = 2

( X x 0,25+ 1999) x2000= ( 53+1999) x2000

( X x 0,25+ 1999)          = ( 53+1999)x2000:2000

( X x 0,25+1999)            =( 53+1999)

( X x 0,25+1999)             = 2052

X+0,25                           = 2052 - 1999

X+ 0,25                             = 53

X                                       = 53:0,25

X                                      = 212

71+65 x4 = x+140/x  + 260

x+140/x + 260= 71+65x4

x+140/x + 260=71 + 260

x+140/x=71

x/x +140/x=71

1+ 140/x=71

140/x=71-1

140/x=70

      x=140/70

      x=2

k nha linh

\(a.\left(x\times0,25+1999\right)\times2000=2052\times2000\\ \left(x\times0,25+1999\right)\times2000=4104000\\ x\times0,25+1999=4104000:2000\\ x\times0,25+1999=2052\\ x\times0,25=2052-1999\\ x\times0,25=53\\ x=53:0,25\\ x=212\)