2
a)\(3\dfrac{1}{2}-\dfrac{1}{2}x=\dfrac{2}{3}\)
\(\dfrac{7}{2}-\dfrac{1}{2}x=\dfrac{2}{3}\)
\(\dfrac{1}{2}x=\dfrac{7}{2}-\dfrac{2}{3}\)
\(\dfrac{1}{2}x=\dfrac{17}{6}\)
\(x=\dfrac{17}{6}\div\dfrac{1}{2}\)
\(x=\dfrac{17}{3}\)
b) \(\dfrac{1}{3}+\dfrac{2}{3}\div x=-7\)
\(\dfrac{2}{3}\div x=-7-\dfrac{1}{3}\)
\(\dfrac{2}{3}\div x=-\dfrac{22}{3}\)
\(x=\dfrac{2}{3}\div-\dfrac{22}{3}\)
\(x=-\dfrac{1}{11}\)
Mấy phần còn lại bạn dùng máy tính fx-500MS dùng để tính nhé