\(\frac{2.6.12}{3.8.15}=\frac{2.3.4}{3.4.3}=\frac{2}{3}\)

Các phân số kia rút gọn cũng vậy.

Vậy kết quả = \(\frac{2}{3}\)

ket qua la 2/3

 ai đi qua mình tích lại cho 2 tích luôn nhé

Ta có: \(\frac{2\cdot6\cdot12+6\cdot12\cdot20+12\cdot21\cdot32}{3\cdot8\cdot15+9\cdot16\cdot25+18\cdot28\cdot40}\)

\(=\frac{2^2\cdot6^2+2^2\cdot6^2\cdot10+2^2\cdot6^2\cdot7\cdot2^3}{3^2\cdot8\cdot5+3^2\cdot8\cdot5\cdot10+3^2\cdot8\cdot5\cdot56}\)

\(=\frac{2^2\cdot6^2\left(1+10+56\right)}{3^2\cdot8\cdot5\left(1+10+56\right)}=\frac{2^2\cdot6^2}{3^2\cdot8\cdot5}\)

\(=\frac{2^2\cdot3^2\cdot2^2}{3^2\cdot2^3\cdot5}=\frac{2^4}{2^3\cdot5}=\frac{2^3\cdot2}{2^3\cdot5}=\frac{2}{5}\)

a)10368

b)24120

mk k biết xin lỗi bạn nha!

mk k biết xin lỗi bạn nha!

mk k biết xin lỗi bạn nha!

mk k biết xin lỗi bạn nha!

2% của nguyên tố zy12

Ta có: \(\frac{1010}{1008\cdot8-994}\)

\(=\frac{1010}{8064-994}=\frac{1010}{7070}=\frac17\)

\(=\frac{1\cdot3}{7\cdot3}=\frac{3}{21}\)

\(\frac{1\cdot2\cdot3+2\cdot4\cdot6+3\cdot6\cdot9+5\cdot10\cdot15}{1\cdot3\cdot6+2\cdot6\cdot12+3\cdot9\cdot18+5\cdot15\cdot30}\)

\(=\frac{1\cdot2\cdot3+1\cdot2\cdot3\cdot2\cdot2\cdot2+1\cdot2\cdot3\cdot3\cdot3\cdot3+1\cdot2\cdot3\cdot5\cdot5\cdot5}{1\cdot3\cdot6+1\cdot3\cdot6\cdot2\cdot2\cdot2+1\cdot3\cdot6\cdot3\cdot3\cdot3+1\cdot3\cdot6\cdot5\cdot5\cdot5}\)

\(=\frac{1\cdot2\cdot3\left(1+2^3+3^3+5^3\right)}{1\cdot3\cdot6\cdot\left(1+2^3+3^3+5^3\right)}=\frac26=\frac13\)

\(=\frac{1\cdot7}{3\cdot7}=\frac{7}{21}\)

\(B=\frac{\text{1.2.3+2.4.6+4.8.12+7.14.21 }}{\text{1.3.6+2.6.12+4.12.24+7.21.42 }}=\frac{1.2.3.\left(1+2+4+7\right)}{1.3.6.\left(1+2+4+7\right)}=\frac{1.2.3}{1.3.6}=\frac{2}{6}=\frac{1}{3}\)