Bài 2

a) x=5

b)x=1

Ta có: \(\frac{1}{2}.x+\frac{3}{5}.\left(x-2\right)=3\)

\(\Rightarrow\frac{1}{2}x+\frac{3}{5}x-\frac{6}{5}=3\)

\(\Rightarrow\frac{11}{10}x-\frac{6}{5}=3\)

\(\Rightarrow\frac{11}{10}x=3+\frac{6}{5}=\frac{21}{5}\)

\(\Rightarrow x=\frac{21}{5}:\frac{11}{10}=\frac{42}{11}\)

Vậy \(x=\frac{42}{11}\)

Ủng hộ tớ nha?

đúng k zậy bạn?^^

thanks

\(3\times x-x\times2=7\frac{3}{8}+\frac{5}{8}\)

\(x\left(3-2\right)=8\)

\(x=8\)

3 nhân x - x nhân 2 = 7 3/8 + 5/8 

x nhân (3-2) = 7 3/8 + 5/8 

x = 7 3/8 + 5/8 

\(\frac{x}{6}+\frac{7}{3.2^2}=\frac{17}{18}-\frac{1}{3^2}\)

\(\frac{x}{6}+\frac{7}{12}=\frac{5}{6}\)

\(\frac{x}{6}=\frac{5}{6}-\frac{7}{12}\)

\(\frac{x}{6}=\frac{1}{4}\)

\(x=\frac{1}{4}.6\)

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

x = 6 nha .

Ta có: 

1/3 x X + 2/5 x ( X-1) = 4 

1/3 x X + 2/5 x X  - 2/5 = 4

X x ( 1/3 + 2/5 ) - 2/5 = 4

X x 11/15 = 4 + 2/5

X x 11/15 = 22/5

X            = 22/5 : 11/5

X            = 2

k mình nha   :)

Ta có: \(\frac{1}{3}\times x+\frac{2}{5}\times\left(x-1\right)=4\)

\(\Rightarrow\frac{1}{3}\times x+\frac{2}{5}\times x-\frac{2}{5}=4\)

\(\Rightarrow x\times\left(\frac{1}{3}+\frac{2}{5}\right)-\frac{2}{5}=4\)

\(\Rightarrow x\times\frac{11}{15}-\frac{2}{5}=4\)

\(\Rightarrow x\times\frac{11}{15}=4+\frac{2}{5}=\frac{22}{5}\)

\(\Rightarrow x=\frac{22}{5}:\frac{11}{15}=\frac{22}{5}\times\frac{15}{11}\)

\(\Rightarrow x=6\)

Vậy \(x=6\)

10/3 x 1/2 - ( 1/2 x X - 1/3) + 1/5 = 3/5 :1/2

5/3 - ( 1/2 x X - 1/3) + 1/5 = 6/5

5/3 - ( 1/2 x X - 1/3) = 6/5 + 1/5

5/3 - ( 1/2 x X - 1/3) = 7/5

1/2 x X - 1/3 = 5/3 - 7/5

1/2 x X - 1/3 = 4/15

1/2 x X = 4/15 + 1/3

1/2 x X = 9/15

X = 9/15 : 1/2

X = 18/15.

Đây nha

bạn duy chưa rút gọn nha