Câu hỏi của Han Yujin

Question

a) 18/24 + 35/-21 - 1/2b) -2/3 - 3/-4 + 5/-6c) ( 3/4 + -7/2) . ( 10/11 + 2/22)d) ( 7/3 - -7/2) : ( -25/6 . 1/5)

Nguyễn Lê Phước Thịnh · Accepted Answer

a: $\dfrac{18}{24}+\dfrac{35}{-21}-\dfrac{1}{2}$$=\dfrac{3}{4}-\dfrac{5}{3}-\dfrac{1}{2}$$=\dfrac{9-20-6}{12}=\dfrac{-17}{12}$b: $\dfrac{-2}{3}-\dfrac{3}{-4}+\dfrac{5}{-6}$$=-\dfrac{2}{3}+\dfrac{3}{4}-\dfrac{5}{6}$$=\dfrac{-8+9-10}{12}=\dfrac{-9}{12}=\dfrac{-3}{4}$c: $\left(\dfrac{3}{4}+\dfrac{-7}{2}\right)\cdot\left(\dfrac{10}{11}+\dfrac{2}{22}\right)$$=\left(\dfrac{3}{4}-\dfrac{14}{4}\right)\cdot\left(\dfrac{10}{11}+\dfrac{1}{11}\right)$$=-\dfrac{11}{4}\cdot1=-\dfrac{11}{4}$d: $\left(\dfrac{7}{3}-\dfrac{-7}{2}\right):\left(-\dfrac{25}{6}\cdot\dfrac{1}{5}\right)$$=\left(\dfrac{7}{3}+\dfrac{7}{2}\right):\dfrac{-5}{6}$$=\dfrac{35}{6}\cdot\dfrac{6}{-5}=\dfrac{35}{-5}=-7$Câu trả lời: a: $\dfrac{18}{24}+\dfrac{35}{-21}-\dfrac{1}{2}$$=\dfrac{3}{4}-\dfrac{5}{3}-\dfrac{1}{2}$$=\dfrac{9-20-6}{12}=\dfrac{-17}{12}$b: $\dfrac{-2}{3}-\dfrac{3}{-4}+\dfrac{5}{-6}$$=-\dfrac{2}{3}+\dfrac{3}{4}-\dfrac{5}{6}$$=\dfrac{-8+9-10}{12}=\dfrac{-9}{12}=\dfrac{-3}{4}$c: $\left(\dfrac{3}{4}+\dfrac{-7}{2}\right)\cdot\left(\dfrac{10}{11}+\dfrac{2}{22}\right)$$=\left(\dfrac{3}{4}-\dfrac{14}{4}\right)\cdot\left(\dfrac{10}{11}+\dfrac{1}{11}\right)$$=-\dfrac{11}{4}\cdot1=-\dfrac{11}{4}$d: $\left(\dfrac{7}{3}-\dfrac{-7}{2}\right):\left(-\dfrac{25}{6}\cdot\dfrac{1}{5}\right)$$=\left(\dfrac{7}{3}+\dfrac{7}{2}\right):\dfrac{-5}{6}$$=\dfrac{35}{6}\cdot\dfrac{6}{-5}=\dfrac{35}{-5}=-7$

Kiều Vũ Linh · Answer

a) $\dfrac{18}{24}+\dfrac{35}{-21}-\dfrac{1}{2}$$=\dfrac{3}{4}-\dfrac{5}{3}-\dfrac{1}{2}$$=\dfrac{9}{12}-\dfrac{20}{12}-\dfrac{6}{12}$$=\dfrac{-17}{12}$b) $\dfrac{-2}{3}-\dfrac{3}{-4}+\dfrac{5}{-6}$$=\dfrac{-8}{12}+\dfrac{9}{12}-\dfrac{10}{12}$$=\dfrac{-9}{12}$$=\dfrac{-3}{4}$c) $\left(\dfrac{3}{4}+\dfrac{-7}{2}\right).\left(\dfrac{10}{11}+\dfrac{2}{22}\right)$$=\dfrac{-11}{4}.1$$=\dfrac{-11}{4}$d) $\left(\dfrac{7}{3}-\dfrac{-7}{2}\right):\left(-\dfrac{25}{6}.\dfrac{1}{5}\right)$$=\dfrac{35}{6}:\dfrac{-5}{6}$$=-7$Câu trả lời: a) $\dfrac{18}{24}+\dfrac{35}{-21}-\dfrac{1}{2}$$=\dfrac{3}{4}-\dfrac{5}{3}-\dfrac{1}{2}$$=\dfrac{9}{12}-\dfrac{20}{12}-\dfrac{6}{12}$$=\dfrac{-17}{12}$b) $\dfrac{-2}{3}-\dfrac{3}{-4}+\dfrac{5}{-6}$$=\dfrac{-8}{12}+\dfrac{9}{12}-\dfrac{10}{12}$$=\dfrac{-9}{12}$$=\dfrac{-3}{4}$c) $\left(\dfrac{3}{4}+\dfrac{-7}{2}\right).\left(\dfrac{10}{11}+\dfrac{2}{22}\right)$$=\dfrac{-11}{4}.1$$=\dfrac{-11}{4}$d) $\left(\dfrac{7}{3}-\dfrac{-7}{2}\right):\left(-\dfrac{25}{6}.\dfrac{1}{5}\right)$$=\dfrac{35}{6}:\dfrac{-5}{6}$$=-7$

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