Question

Tính theo cách đổi ra phân số á

(3\(\dfrac{1}{2}\) + 0,25 ) - ( \(\dfrac{1}{4}\) - 3,25 + \(\dfrac{1}{2}\))

Answer 1

\(\left(3\dfrac{1}{2}+0,25\right)-\left(\dfrac{1}{4}-3,25+\dfrac{1}{2}\right)\)

\(=\left(\dfrac{7}{2}+\dfrac{1}{4}\right)-\left(\dfrac{1}{4}-\dfrac{13}{4}+\dfrac{1}{2}\right)\)

\(=\dfrac{7}{2}+\dfrac{1}{4}-\dfrac{1}{4}+\dfrac{13}{4}-\dfrac{1}{2}\)

\(=\left(\dfrac{7}{2}-\dfrac{1}{2}\right)+\dfrac{13}{4}\)

\(=3+\dfrac{13}{4}\)

\(=\dfrac{12}{4}+\dfrac{13}{4}\)

\(=\dfrac{25}{4}\)

Answer 2

\(\left(3\dfrac{1}{2}+0,25\right)-\left(\dfrac{1}{4}-3,25+\dfrac{1}{2}\right)\)

\(=3,5+0,25-0,25+3,25-0,5\)

\(=6,75-0,5=6,25\)=25/4