Question

[Hà Trang]

Bài 1: 

a, \(\frac{3}{5}\)+ \(\frac{6}{11}\)+\(\frac{7}{13}+\frac{6}{11}\)+\(\frac{2}{5}+\frac{19}{13}\)

b,\(\frac{6}{5}\)x\(\frac{3}{8}+\frac{5}{8}\)x\(\frac{6}{5}-\frac{4}{5}\)

c,4 x 5 x 6 x 7 x 8 

________________

8 x 10 x12 x 14x 16

Answer 1

[Thanh Tùng DZ]

a) \(\frac{3}{5}+\frac{6}{11}+\frac{7}{13}+\frac{5}{11}+\frac{2}{5}+\frac{19}{13}=\left(\frac{3}{5}+\frac{2}{5}\right)+\left(\frac{6}{11}+\frac{5}{11}\right)+\left(\frac{7}{13}+\frac{19}{13}\right)=1+1+2=4\)

b) \(\frac{6}{5}\times\frac{3}{8}+\frac{5}{8}\times\frac{6}{5}-\frac{4}{5}=\frac{6}{5}\times\left(\frac{3}{8}+\frac{5}{8}\right)-\frac{4}{5}=\frac{6}{5}-\frac{4}{5}=\frac{2}{5}\)

c) \(\frac{4\times5\times6\times7\times8}{8\times10\times12\times14\times16}=\frac{1}{2\times2\times2\times2\times2}=\frac{1}{32}\)

Answer 2

[Nguyễn Phạm Hồng Anh]

a, \(\frac{3}{5}+\frac{6}{11}+\frac{7}{13}+\frac{6}{11}+\frac{2}{5}+\frac{19}{13}\)

\(=\left(\frac{3}{5}+\frac{2}{5}\right)+\left(\frac{7}{13}+\frac{19}{13}\right)+\left(\frac{6}{11}+\frac{6}{11}\right)\)

\(=1+2+\frac{12}{11}\)

\(=3+\frac{12}{11}\)

\(=\frac{45}{11}\)