Question

[lại tiến mạnh]

a)1/2x+2/5=7/5     b)25/9-3/4(x+1)=7/9

chu y / là phân số cần gấp ạ

Answer 1

[Khanh Nguyễn Ngọc]

a) \(\frac{1}{2}x+\frac{2}{5}=\frac{7}{5}\Leftrightarrow\frac{x}{2}=\frac{7}{5}-\frac{2}{5}=\frac{5}{5}=1\Leftrightarrow x=2\)

b) \(\frac{25}{9}-\frac{3}{4}\left(x+1\right)=\frac{7}{9}\Leftrightarrow\frac{3}{4}\left(x+1\right)=\frac{25}{9}-\frac{7}{9}=\frac{18}{9}=2\)

\(\Leftrightarrow x+1=2.\frac{4}{3}\Leftrightarrow x=\frac{5}{3}\)

Answer 2

[乡☪ɦαทɦ💥☪ɦųα✔]

Bài làm :

\(a,\frac{1}{2}x+\frac{2}{5}=\frac{7}{5}\)

\(\Rightarrow\frac{1}{2}x=\frac{7}{5}-\frac{2}{5}\)

\(\Rightarrow\frac{1}{2}x=1\)

\(\Rightarrow x=2\)

Vậy x = 2 .

\(b,\frac{25}{9}-\frac{3}{4}\left(x+1\right)=\frac{7}{9}\)

\(\Rightarrow\frac{3}{4}\left(x+1\right)=\frac{25}{9}-\frac{7}{9}\)

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

\(\Rightarrow x+1=\frac{8}{3}\)

\(\Rightarrow x=\frac{5}{3}\)

Vậy \(x=\frac{5}{3}\) .

Học tốt nhé