Question

(4,5 - 2x). 1 4/7 =11/14

Answer 1

Theo bài ra, ta có:

\(\left(4,5-2x\right).1\dfrac{4}{7}=\dfrac{11}{14}\\ \left(4,5-2x\right).\dfrac{11}{7}=\dfrac{11}{14}\\ 4,5-2x=\dfrac{11}{14}:\dfrac{11}{7}\\ 4,5-2x=\dfrac{1}{2}\\ 2x=4,5-\dfrac{1}{2}\\ \Rightarrow2x=4\\ \Rightarrow x=2\)

Vậy x = 2

Answer 2

\(\left(4,5-2x\right).1\dfrac{4}{7}=\dfrac{11}{14}\)

\(\Leftrightarrow\left(4,5-2x\right).\dfrac{11}{7}=\dfrac{11}{14}\)

\(\Leftrightarrow4,5-2x=\dfrac{11}{14}:\dfrac{11}{7}\)

\(\Leftrightarrow4,5-2x=\dfrac{11}{14}.\dfrac{7}{11}\)

\(\Leftrightarrow4,5-2x=\dfrac{1}{2}\)

\(\Leftrightarrow-2x=\dfrac{1}{2}-4,5\)

\(\Leftrightarrow-2x=-4\)

\(\Leftrightarrow x=2\)

Vậy phương trình có ngiệm x = 2 .