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

0,25 voi 1,25 o dau ra

x:4+x=3,75

x*1/4+x=3,75

x*5/4=3,75

x=3

Vậy x=3

Nhớ k cho mình nhé

\(x\div4+x=3,75\)

\(\Leftrightarrow\frac{x}{4}+x=3,75\)

\(\Leftrightarrow x\left(\frac{1}{4}+1\right)=3,75\)

\(\Leftrightarrow x\left(\frac{1}{4}+\frac{4}{4}\right)=3,75\)

\(\Leftrightarrow\frac{5}{4}x=3,75\)

\(\Leftrightarrow x=3,75\div\frac{5}{4}\)

\(\Leftrightarrow x=3,75\times\frac{4}{5}\)

\(\Leftrightarrow x=3\)

\(x\div4+x=3,75\)

\(x\times0,25+x=3,75\)

\(x\times\left(0,25+1\right)=3,75\)

\(x\times1,25=3,75\)

\(x=3,75\div1,25\)

\(x=3\)

~ Thiên Mã ~

ffffffg đúng rồi bạn ơi !!!

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

=> 1,25X = 3,75

=> X = 3,75 : 1,25

=> X = 3

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

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

|x+4/15|=1,6

=>x+4/15=1,6 hoặc x+4/15=-1,6

x=1,6-4/15              x=-1,6-4/15

x=4/3                      x=-28/15

b)|x-5/3|<1/3

*)x-5/3<1/3

x<1/3+5/3=6/3

x<2

*)x-5/3<-1/3

x<-1/3+5/3

x<4/3

=>x<4/3

Vậy x<4/3

| 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)

x+4/15=-1.6

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

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

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

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

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

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

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

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

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

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

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

| x + 4/15 | - | - 3,75 | = - | - 2,15 |
\(\Rightarrow\)| x + 4/15 | -  3,75  = - 2,15 |

\(\Rightarrow\)| x + 4/15 | =  3,75  +  (- 2,15)

\(\Rightarrow\)| x + 4/15 | =1,6

\(\Rightarrow\)x+4/15=1,6 hoặc x+4/15=-1,6

Ta xét các trường hợp

TH1: x+4/15=1,6\(\Rightarrow\)x=4/3

TH2:x+4/15=-1,6 \(\Rightarrow\)x=-28/15

Vậy x=4/3 hoặc -28/15

1). 7,5 x X + X x 3,5 = 39,93
    X x (7,5 + 3,5) = 39,93
    X x 11 = 39,93
    X = 39,93 : 11
    X = 3,63
2) x : 4 + x = 3,75
    x : 4 + x : 1 = 3,75
    x : (4 + 1) = 3,75
    x : 5 = 3,75
    x = 3,75 : 5 = 0,75

x ; 4 + x = 3,75

x * 0,25 + x = 3,75 

x * (0,25 + 1) = 3,75

x * 1,25 = 3,75

x = 3,75/1,25

x = 3

SAKURA  thu linh the bai tra loi sai toet toen toen