\(\frac{2}{3}.x=\frac{1}{3}\)1) x-\(\frac{10}{3}\)=\(\frac{7}{15}.\frac{3}{5}\)

x-10/3=7/25

x=7/25+10/3

x=\(\frac{271}{75}\)

2)\(\frac{8}{23}.\frac{46}{24}.x=\frac{1}{3}\)

2/3.x=1/3

x=1/3:2/3

x=1/2

\(\frac{8}{23}\).\(\frac{46}{24}\)=\(\frac{1}{3}\).x

\(\frac{8}{24}\).\(\frac{46}{23}\)=\(\frac{1}{3}\).x

\(\frac{1}{3}\).2=\(\frac{1}{3}\).x

x=2

\(\frac{8}{23}\times\frac{46}{24}=\frac{1}{3}\times x\)

\(\frac{1}{3}\times x=\frac{2}{3}\)

\(x=\frac{2}{3}\div\frac{1}{3}\)

\(x=\frac{2}{3}\times3\)

x = 2

Chúc bạn học tốt

1: 7-x=8+(-7)

=>7-x=8-7=1

=>x=7-1=6

2: \(x-8=\left(-3\right)-8\)

=>x-8=-11

=>\(x=-11+8=-3\)

3: \(2-x=10-9+23\)

=>\(2-x=33-9=24\)

=>x=2-24=-22

4: \(-2-x=15\)

=>\(x=-2-15=-17\)

5: \(-7+x-8=-3-1+13\)

=>x-14=13-4=9

=>x=9+14=23

6: 100-x+7=-x+3

=>107-x=3-x

=>107=3(vô lý)

7: \(23+x=8-2x\)

=>\(x+2x=8-23\)

=>3x=-15

=>x=-15/3=-5

\(\frac{1-2x}{10}+\frac{3-2x}{8}+\frac{23-2x}{6}=0\)

\(\Leftrightarrow\frac{1}{10}-\frac{2x}{10}+\frac{3}{8}-\frac{2x}{8}+\frac{23}{6}-\frac{2x}{6}=0\)

\(\Leftrightarrow\frac{1}{10}-\frac{x}{5}+\frac{3}{8}-\frac{x}{4}+\frac{23}{6}-\frac{x}{3}=0\)

\(\Leftrightarrow\left(\frac{1}{10}+\frac{3}{8}+\frac{23}{6}\right)-\left(\frac{x}{3}+\frac{x}{4}+\frac{x}{5}\right)=0\)

\(\Leftrightarrow\frac{517}{120}-\left(\frac{x}{3}+\frac{x}{4}+\frac{x}{5}\right)=0\)

\(\Leftrightarrow x\left(\frac{1}{3}+\frac{1}{4}+\frac{1}{5}\right)=\frac{517}{120}\)

\(\Leftrightarrow x.\frac{47}{60}=\frac{517}{120}\)

\(\Rightarrow x=\frac{517}{120}:\frac{47}{60}=\frac{11}{2}\)

Vậy \(x=\frac{11}{2}\)

(1-2x)/10+(3-2x)/8+(23-2x)/6=0

[48(1-2x)+60(3-2x)+80(23-2x)]/480=0

48-96x+180-120x+1840-160x=0

2068-376x=0

-376x=-2068

x=11/2

Gợi ý thui :v

Giải hơi dài dòng :v

\(a,x-\frac{1}{5}=-2\frac{1}{3}\)

\(\Rightarrow x-\frac{1}{5}=-\frac{7}{3}\)

\(\Leftrightarrow x=-\frac{7}{3}+\frac{1}{5}=-\frac{32}{15}\)

\(b,\frac{1}{4}+\frac{3}{4}:x=\frac{1}{2}\)

\(\Rightarrow\frac{3}{4}:x=\frac{1}{2}-\frac{1}{4}\)

\(\Rightarrow\frac{3}{4}x=\frac{1}{4}\Leftrightarrow x=\frac{1}{3}\)

c, Tự làm

a. x - 1/5 = -2 1/3

    x - 1/5 = -7/3

    x         = -2 2/15

b. 1/4 + 3/4 : x = 1/2

             3/4 : x = 1/2 - 1/4

             3/4 : x = 1/4

                     x = 3/4 x 4

                     x = 3

c. -0,75x + 8/11x = 23/44

     (-3/4 + 8/11)x = 23/44

                -1/44x = 23/44

                        x = -23

\(a,x-\frac{1}{5}=-2\frac{1}{3}\)

\(\Rightarrow x-\frac{1}{5}=\frac{-7}{3}\)

\(\Rightarrow x=\frac{-7}{3}+\frac{1}{5}\)

\(\Rightarrow x=\frac{-35}{15}+\frac{3}{15}\)

\(\Rightarrow x=\frac{-32}{15}\)

\(x-\frac{1}{5}=-2\frac{1}{3}\)

\(x-\frac{1}{5}=\frac{-7}{3}\)

\(x=\frac{-7}{3}+\frac{1}{5}\)

\(x=\frac{-32}{15}\)

~ Hok tốt ~

a, x - 1/5= -21/3
x= -21/3 + 1/5
x= -6,8

b, 1/4 + 3/4 :x = 1/2
             3/4 :x = 1/2 - 1/4= 1/4
                    x = 3/4 : 1/4 = 3

c,- 0,75x + 8/11x = 23/44
   x. (-3/4 + 8/11) = 23/44
   x. -1/44= 23/44
   x          = 23/44 : -1/44
   x          = -23

\(\frac{1}{4}+\frac{3}{4}:x=\frac{1}{2}\)

\(\frac{3}{4}:x=\frac{1}{2}-\frac{1}{4}\)

\(\frac{3}{4}:x=\frac{1}{4}\)

\(x=\frac{3}{4}:\frac{1}{4}\)

\(x=3\)

~ Hok tốt ~

a) 2016 - 100.(x+31)=2⁷:2³ 

<=> 2016 - 100.(x+31) = 2⁴ = 16

<=> 100.(x+31) = 2016 - 16 = 2000

<=> x+31 = 2000:100 = 20

<=> x = 20 - 31 = -11

b) (x+8)³ = 125

<=> (x+8)³ = 5³ 

<=> x+8 = 5

<=> x = 5 - 8

<=> x = -3