Question

Tính.

a)\(N=\dfrac{6:\dfrac{3}{5}-1\dfrac{1}{6}.\dfrac{6}{7}}{\dfrac{1}{5}.\dfrac{10}{11}+5\dfrac{2}{11}}\)

b)Tính nhanh:

\(K=\dfrac{75}{100}+\dfrac{18}{21}+\dfrac{19}{32}+\dfrac{1}{4}+\dfrac{3}{21}+\dfrac{13}{32}\)

Answer 1

b, \(K =\) \(\dfrac{75}{100}+\dfrac{18}{21}+\dfrac{19}{32}+\dfrac{1}{4}+\dfrac{3}{21}+\dfrac{13}{32}\)

\(K = \) \(\dfrac{3}{4}+\dfrac{18}{21}+\dfrac{19}{32}+\dfrac{1}{4}+\dfrac{3}{21}+\dfrac{13}{32}\)

\(K = \) \(\left(\dfrac{3}{4}+\dfrac{1}{4}\right)+\left(\dfrac{18}{21}+\dfrac{3}{21}\right)+\left(\dfrac{19}{32}+\dfrac{13}{32}\right)\)

\(K = \) \(1 + 1 + 1\)

\(K = \) \(3\)