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

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

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

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

`x: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

128 xX - X -X :0,25 = 2020

=> X x (128-1 - 4) =2020

=>X x 123 =2020

=>x=2020/123

cj đx hởi ex

128 * x - x - x:0,25 = 2020

x * 128 - x * 1 - x * 4 = 2020

x * (128- 1- 4) = 2020

x * 123 = 2020

x = 2020 : 123

x = 2020/123

Vậy x = 2020/123

a) \(210:x=2,1:0,25=8,4\)

\(x=210:8,4=25\)

b) \(x.2+x.0,5=6,25\)

\(2,5x=6,25\)

\(x=6,25:2,5=2,5\)

c) \(x:0,25-x=15,6\)

\(3x=15,6\)

\(x=5,2\)

d) \(x:12,5=3,75.4=15\)

\(x=15.12,5=187,5\)

e) \(x.12,6-x.5,6=42\)

\(7x=42\)

\(x=6\)

g) \(x:0,1-x:4-x.0,75=2,25\)

\(10x-\dfrac{x}{4}-\dfrac{3x}{4}=2,25\)

\(9x=2,25\)

\(x=0,25\)

giúp mình gấp mn

wth khó thế

(8,2 +X) = 8,45 : 4,1

( 8,2 + X ) = 2,06''

X = 2,06'' - 8,2

X = -6,14

x:0,25 + X x0,25=3,4

(0,25+0,25) :x=3,4

0,5:x=3,4

x=3,4:0,5

x=6,8

a) \(x:0,25+x.0,25=3,4\)

\(\Leftrightarrow x:\dfrac{1}{4}+\dfrac{1}{4}x=3,4\)

\(\Leftrightarrow4x+\dfrac{1}{4}x=3,4\Leftrightarrow\dfrac{17}{4}x=3,4\Leftrightarrow x=3,4:\dfrac{17}{4}\)

\(\Leftrightarrow x=0,8\)

b) \(0,7:x+0,5:x=0,75\)

<=> \(\left(0,7+0.5\right):x=0,75\)

<=> \(1,2:x=0,75\)

<=> \(x=1,6\)

X : 0,25 + X - 5 = 7

X x 4 + X - 5 = 7

X . ( 4 + 1 ) = 7 + 5

X . 5 = 12

X = 12 : 5 = \(\frac{12}{5}\)

X : 0,25 - X + 5 = 3

 X x 4 - X + 5 = 3

X x ( 4 - 1 ) = 3 - 5

X x 3 = -2

X = -2 : 3 = \(\frac{-2}{3}\)