Question

a) \(\dfrac{12}{25}\)+\(\dfrac{5}{13}\)+\(\dfrac{13}{25}\)-\(\dfrac{18}{13}\)+\(\dfrac{3}{5}\)

b) \(\dfrac{2}{3}\):(\(\dfrac{5}{2}\)-\(\dfrac{3}{4}\))

{Ai bít hộ mik với thanks nhớ trình bày hợp lý nha}

Answer 1

a) \(\dfrac{12}{25}+\dfrac{5}{13}+\dfrac{13}{25}-\dfrac{18}{13}+\dfrac{3}{5}\)

\(=\left(\dfrac{12}{25}+\dfrac{13}{25}\right)+\left(\dfrac{5}{13}-\dfrac{18}{13}\right)+\dfrac{3}{5}\)

\(=1+\left(-1\right)+\dfrac{3}{5}\)

\(=0+\dfrac{3}{5}\)

\(=\dfrac{3}{5}\)

b) \(\dfrac{2}{5}:\left(\dfrac{5}{2}-\dfrac{3}{4}\right)\)

\(=\dfrac{2}{3}:\dfrac{3}{4}\)

\(=\dfrac{8}{21}\)

tích mình nha

Answer 2

a) \(\dfrac{12}{25}+\dfrac{5}{13}+\dfrac{13}{25}-\dfrac{18}{13}+\dfrac{3}{5}\)

= \(\left(\dfrac{12}{25}+\dfrac{13}{25}\right)+\left(\dfrac{5}{13}-\dfrac{18}{13}\right)+\dfrac{3}{5}\)

= 1 + (-1) + \(\dfrac{3}{5}\)

= 0 + \(\dfrac{3}{5}\) = \(\dfrac{3}{5}\)

b) \(\dfrac{2}{3}:\left(\dfrac{5}{2}-\dfrac{3}{4}\right)\)

=\(\dfrac{2}{3}:\left(\dfrac{10}{4}-\dfrac{3}{4}\right)\)

=\(\dfrac{2}{3}:\dfrac{7}{4}\)

=\(\dfrac{2}{3}.\dfrac{4}{7}\)

=\(\dfrac{8}{21}\)

Chúc bạn học tốt!!!