Câu hỏi của Nguyễn Huy

Question

tui cần gấp, trình bày ra nhé, ai nhanh m tích, chỉ cần làm bài 2 thôi undefined

Nguyễn Lê Phước Thịnh · Accepted Answer

Bài 2:

a: $=\dfrac{-2}{3}\left(\dfrac{5}{17}+\dfrac{12}{17}\right)+\dfrac{2}{3}=\dfrac{-2}{3}+\dfrac{2}{3}=0$

b: $=\dfrac{3}{4}\left(\dfrac{9}{13}+\dfrac{7}{13}-\dfrac{3}{13}\right)=\dfrac{3}{4}$

c: $=\dfrac{-7}{12}\left(\dfrac{5}{11}+\dfrac{5}{11}\right)-\dfrac{1}{3}=\dfrac{-7}{12}\cdot\dfrac{10}{11}-\dfrac{1}{3}=-\dfrac{19}{22}$

Câu trả lời:

Bài 2:

a: $=\dfrac{-2}{3}\left(\dfrac{5}{17}+\dfrac{12}{17}\right)+\dfrac{2}{3}=\dfrac{-2}{3}+\dfrac{2}{3}=0$

b: $=\dfrac{3}{4}\left(\dfrac{9}{13}+\dfrac{7}{13}-\dfrac{3}{13}\right)=\dfrac{3}{4}$

c: $=\dfrac{-7}{12}\left(\dfrac{5}{11}+\dfrac{5}{11}\right)-\dfrac{1}{3}=\dfrac{-7}{12}\cdot\dfrac{10}{11}-\dfrac{1}{3}=-\dfrac{19}{22}$