`x:0,25+x xx11=39`

`x xx4 + x xx11=39`

`x xx(4+11)=39`

`x xx15=39`

`x =13/5`

X:0,25+X x 11 =39

=> X x 4 + X x 11 =39

=> X x( 4+11) =39

=> X x 15 =39

=>         X =39 :15

=>         X=2,6

= X x 4 + X x 11 = 39 

= X x 15 = 39

= 39 / 15 = 2,6

x * 4 + x * 11 = 24

 x * ( 4 + 11 ) = 24

x * 15 = 24

x = 24 : 15

x = 1.6

X:0,25+Xx11=24

Xx4/1+Xx11=24

Xx(4/1+11)=24

Xx(15)=24

X=24:15

X=24/15

a, x :0,25+x.11=24

    x:1/4+x.11=24

    x.4+x.11=24

    x.(4+11)=24

    x.15=24

    x  =24:15

    x=1,6

b, x.8,01-x:100=38

    x.801/100-x.1/100=38

    x.(801/100-1/100)=38

     x.8=34

     x=34:8

     x=4,25

 a)

X : 0,25 + X x 11 = 24

<=> X : 1/4 + X x 11 = 24

<=> X x 4 + X x 11 = 24

=> X x ( 4 + 11 ) = 24

=> X x 15 = 24

=> X = 1,6

b)

X x 8,01 - X : 100 = 38

<=> X x 8,01 - X : 1/100 = 38

<=> X x 8,01 - X x 0,01 = 38

=> X x ( 8,01 - 0,01 ) = 38

=> X x 8 = 38

=> x = 4,75

1:

a: =5/4+25=25,25

\(x+x:0,5+x:0,25+x:0,125=75\)

\(x+x\cdot2+x\cdot4+x\cdot8=75\)

\(x\cdot\left(1+2+4+8\right)=75\)

\(x\cdot15=75\\ x=75:15\\ x=5\)

⇒ X x 4 + X x 11 = 24

⇒ X x ( 4+11) = 24

⇒ X x 15 = 24

⇒ X  = 24 : 15 = 1,6

X: 0,25 + X x 11 = 24
<=> X x 4 + X x 11= 24
<=> X x (4+11)= 24
<=> X x 15= 24
=> X= 24/15

\(x:0,25+x\times11=24\)

\(\Rightarrow x\times4+x\times11=24\)

\(\Rightarrow x\times\left(4+11\right)=24\)

\(\Rightarrow x\times15=24\)

\(\Rightarrow x=\dfrac{8}{5}\)

Vậy: \(x=\dfrac{8}{5}\)