Question

[iuiu iuiu]

b)-1/2-2/3+(-3)/4+2/3

c)-4/3-3/8+7/3-3/2

nhanh nhé mai mình nộp ròi ai trc thì dc 5 sao + lời giải hay nhất

Answer 1

[subjects]

\(-\dfrac{1}{2}-\dfrac{2}{3}+\left(\dfrac{-3}{4}\right)+\dfrac{2}{3}\\ =-\dfrac{1}{2}-\dfrac{3}{4}-\left(\dfrac{2}{3}-\dfrac{2}{3}\right)\\ =-\dfrac{1}{2}-\dfrac{3}{4}=-\left(\dfrac{1}{2}+\dfrac{3}{4}\right)=-\dfrac{5}{4}\)

\(-\dfrac{4}{3}-\dfrac{3}{8}+\dfrac{7}{3}-\dfrac{3}{2}\\ =-\left(\dfrac{4}{3}-\dfrac{7}{3}\right)-\dfrac{3}{8}-\dfrac{3}{2}\\ =-\left(-\dfrac{3}{3}\right)-\dfrac{3}{8}-\dfrac{3}{2}\\ =1-\dfrac{3}{8}-\dfrac{3}{2}\\ =\dfrac{8}{8}-\dfrac{3}{8}-\dfrac{12}{8}=-\dfrac{7}{8}\)

Answer 2

[HT.Phong (9A5)]

b) \(-\dfrac{1}{2}-\dfrac{2}{3}+\dfrac{-3}{4}+\dfrac{2}{3}\)

\(=\left(-\dfrac{1}{2}+\dfrac{-3}{4}\right)+\left(-\dfrac{2}{3}+\dfrac{2}{3}\right)\)

\(=\left(\dfrac{-2}{4}+\dfrac{-3}{4}\right)+0\)

\(=\dfrac{-5}{4}\)

c) \(\dfrac{-4}{3}-\dfrac{3}{8}+\dfrac{7}{3}-\dfrac{3}{2}\) 

\(=\left(\dfrac{-4}{3}+\dfrac{7}{3}\right)+\left(-\dfrac{3}{8}-\dfrac{3}{2}\right)\)

\(=\dfrac{3}{3}+\left(-\dfrac{3}{8}-\dfrac{12}{8}\right)\)

\(=1-\dfrac{15}{8}\)

\(=-\dfrac{7}{8}\)