\(\left(3\dfrac{1}{2}-2x\right):75\%=7\dfrac{1}{3}\\3\dfrac{1}{2}-2x=\dfrac{11}{2} \\ 2x=3\dfrac{1}{2}-\dfrac{11}{2}\\2x=-2\\ \Rightarrow x=-1 \)
\(\left(3\dfrac{1}{2}-2x\right):75\%=7\dfrac{1}{3}\)
\(\dfrac{7}{2}-2x=\dfrac{22}{3}.\dfrac{3}{4}\)
\(\dfrac{7}{2}-2x=\dfrac{11}{2}\)
\(2x=\dfrac{7}{2}-\dfrac{11}{2}\)
\(2x=-2\)
\(x=-2:2\)
\(x=-1\)
e) ( 3\(\dfrac{1}{2}\) - 2x ) : 75% = 7\(\dfrac{1}{3}\)
(\(\dfrac{7}{2}\) - 2x) : \(\dfrac{3}{4}\) = \(\dfrac{22}{3}\)
\(\dfrac{7}{2}\) - 2x = \(\dfrac{22}{3}\) .\(\dfrac{3}{4}\)
\(\dfrac{7}{2}\) - 2x = \(\dfrac{11}{2}\)
2x = \(\dfrac{7}{2}\) - \(\dfrac{11}{2}\)
2x = - 2
x = - 2 : 2
x = -1
Vậy x = -1
Chúc bạn học tốt !!