Question

tìm x biết

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

b) x/3=5/-27

 

Answer 1

a) \(\left(3\frac{2}{5}-2x\right).1\frac{2}{3}=5\frac{1}{7}\)

\(\left(\frac{17}{5}-2x\right).\frac{5}{3}=\frac{36}{7}\)

\(\left(\frac{17}{5}-2x\right)=\frac{36}{7}:\frac{5}{3}\)

\(\left(\frac{17}{5}-2x\right)=\frac{108}{35}\)

\(2x=\frac{17}{5}-\frac{108}{35}=\frac{11}{35}\)

\(x=\frac{11}{35}:2\)

\(x=\frac{11}{35}.\frac{1}{2}=\frac{11}{70}\)

Đúng ko z Kỳ Tỉ

Trả lời0 Đánh dấu

5 giây trước (16:57)

tìm x biết

a) ($3\frac{2}{5}$325 -2x).$1\frac{2}{3}$123 =$5\frac{1}{7}$517 

 

Toán lớp 6               

Answer 2

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

<=>  \(\frac{17}{3}\)  - \(\frac{10}{3}x\) = \(5\frac{1}{7}\)

<=>        \(\frac{10}{3}x\)      =  \(\frac{11}{21}\)

<=>            \(x\)         = \(\frac{11}{70}\)

b)    \(\frac{x}{3}\) = \(\frac{5}{-27}\)

<=>   - 27 x = 15

<=>          x= \(-\frac{5}{9}\)

OK