=>3,75x=3,75x2,1

=>x=2,1

2,1 x 3,75 =X x (0,05+3,7)

2,1 x 3,75 =X x 3,75

X x 3,75 = 2,1 x 3,75

X x 3,75 = 7,875

           X = 7,875 : 3,75

           X = 2,1

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

0,25x + x = 3,75

=> 1,25x = 3,75

=> x = 3,75 : 1,25

=> x = 3

x:4+x=3,75

=> 0,25x+x=3,75

=>1,25x=3,75

=>x=3,75:1,25

=>x=3

Vậy x=3

\(x\) : 4+ \(x\)     = 3,75

\(x\)x 0,25 + \(x\)=3,75

\(x\)x( 1 + 0.25) = 3,75

\(x\)x 1,25          = 3,75

\(x\)                   = 3,75 : 1,25

\(x\)                  = 3

x : 4 + x = 3,75

x/4 + x = 3,75

x/4 + x/1 = 3,75

x/4 + x nhân 4/ 4 = 3,75

x nhân 5/ 4 = 3,75

x nhân 5 = 3,75 x 4

x nhân 5 = 15

x = 15 : 5

x = 3

ffffffg đúng rồi bạn ơi !!!

=> 0,25X + X = 3,75

=> 1,25X = 3,75

=> X = 3,75 : 1,25

=> X = 3

| x + 4/15 | - | - 3,75 | = - | - 2,15 |

| x + 4/15 | - 3,75      = - 2,15

| x + 4/15 |               = - 2,15 + 3,75

| x + 4/15 |               = 1,6

Trường hợp 1 :  x + 4/15 = 1,6   suy ra x = 4/3

Trương hợp 2:  x + 4/15 = - 1,6 suy ra x = -28/15

b) | x + 415 | - | -3,75| = -(-2,15)

\(\left|x+\frac{4}{15}\right|-\left|-3,75\right|=-\left|-2,15\right|\)

\(\Rightarrow\left|x+\frac{4}{15}\right|-3,75=-2,15\)

\(\Rightarrow\left|x+\frac{4}{15}\right|=-2,15+3,75\)

\(\Rightarrow\left|x+\frac{4}{15}\right|=1,6\)

\(\Rightarrow\left|x+\frac{4}{15}\right|=\frac{8}{5}\)

\(\Rightarrow\left[\begin{array}{nghiempt}x+\frac{4}{15}=\frac{8}{5}\\x+\frac{4}{15}=-\frac{8}{5}\end{array}\right.\)

\(\Rightarrow\left[\begin{array}{nghiempt}x=\frac{4}{3}\\x=-\frac{28}{15}\end{array}\right.\)

Ta có : \(\left|x+\frac{4}{15}\right|-\left|-3,75\right|=-\left|-2,15\right|\)

\(\Leftrightarrow\left|x+\frac{4}{15}\right|=3,75-2,15=\frac{8}{5}\)

\(\Rightarrow\left[\begin{array}{nghiempt}x+\frac{4}{15}=\frac{8}{5}\\-x-\frac{4}{15}=\frac{8}{5}\end{array}\right.\)

\(\Leftrightarrow\left[\begin{array}{nghiempt}x=\frac{4}{3}\\x=-\frac{28}{15}\end{array}\right.\)