Question

Thực hiện phép tính:

M= \(\dfrac{-3}{4}.\dfrac{2}{11}+\dfrac{-3}{4}.\dfrac{9}{11}+2\dfrac{3}{4}\)

N=\(\dfrac{6}{8}+\dfrac{5}{8}:5-\dfrac{3}{16}\left(-4\right)^2\)

Answer 1

\(M=\dfrac{-3}{4}\cdot\dfrac{2}{11}+\dfrac{-3}{4}\cdot\dfrac{9}{11}+2\dfrac{3}{4}\)

\(=\dfrac{-3}{4}\cdot\left(\dfrac{2}{11}+\dfrac{9}{11}\right)+\dfrac{11}{4}\\ =\dfrac{-3}{4}\cdot1+\dfrac{11}{4}\\ =-\dfrac{3}{4}+\dfrac{11}{4}\\ =\dfrac{8}{4}\\ =2\)

\(N=\dfrac{6}{8}+\dfrac{5}{8}:5-\dfrac{3}{16}\cdot\left(-4\right)^2\)

\(=\dfrac{6}{8}+\dfrac{1}{8}-\dfrac{3}{16}\cdot16\\ =\dfrac{7}{8}-3\\ =\dfrac{-17}{8}\)