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

=> 1,25X = 3,75

=> X = 3,75 : 1,25

=> X = 3

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

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

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

\(\Leftrightarrow\left|x+\dfrac{4}{15}\right|=\dfrac{8}{5}\)

\(\Leftrightarrow\left[{}\begin{matrix}x+\dfrac{4}{15}=\dfrac{8}{5}\\x+\dfrac{4}{15}=-\dfrac{8}{5}\end{matrix}\right.\)

\(\Leftrightarrow\left[{}\begin{matrix}x=\dfrac{4}{3}\\x=-\dfrac{28}{15}\end{matrix}\right.\)

\(\Rightarrow\left|x+\dfrac{4}{15}\right|-3,75=-2,15\\ \Rightarrow\left|x+\dfrac{4}{15}\right|=1,6=\dfrac{8}{5}\\ \Rightarrow\left[{}\begin{matrix}x+\dfrac{4}{15}=\dfrac{8}{5}\\x+\dfrac{4}{15}=-\dfrac{8}{5}\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=\dfrac{4}{3}\\x=-\dfrac{28}{15}\end{matrix}\right.\)

a,x=7                b, x=.....

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

/x+4/15/-15/4=-\(\frac{43}{20}\)

x+4/15=\(\frac{43}{20}+\frac{15}{4}\)

x+4/15=59/10

    x=59/10-4/15

    x=\(5\frac{19}{30}\)

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 ~

x:4+x=3,75

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

=>1,25x=3,75

=>x=3,75:1,25

=>x=3

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

=> 1,25.x = 3,75

=> x = 3,75 : 1,25

=> x = 3

x = 3 nhé bn 

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