Question

Answer 1

tinh nhanh nha mn

Answer 2

\(\left(1+1\dfrac{1}{4}+1\dfrac{1}{2}+1\dfrac{3}{4}+2+2\dfrac{1}{4}+2\dfrac{1}{2}+2\dfrac{3}{4}+...+4\dfrac{3}{4}\right):23\)

\(=\left(\dfrac{4}{4}+\dfrac{5}{4}+\dfrac{6}{4}+\dfrac{7}{4}+\dfrac{8}{4}+\dfrac{9}{4}+\dfrac{10}{4}+\dfrac{11}{4}+...+\dfrac{19}{4}\right):23\)

\(=\dfrac{4+5+6+...+19}{4}:23\)

\(=\dfrac{\left(\dfrac{19-4}{1}-1\right)\left(19+4\right)}{4}:23\)

\(=\dfrac{7}{2}\)