\(\frac{2.6.12+6.12.20+12.21.32}{3.8.15+9.16.25+18.28.40}\)

\(=\frac{12.\left(12+120+672\right)}{3.\left(120+1200+6720\right)}\)

\(=\frac{12.\left(12+120+672\right)}{30\left(12+120+672\right)}\)

\(=\frac{12}{30}\)

\(=\frac{2}{5}\)

\(\frac{2.6.12+6.12.20+12.21.32}{3.8.15+9.16.25+18.28.40}\)

=\(\frac{2.6.12+6.12.2.10+12.3.7.4.8}{3.8.15+9.2.8.5.5+9.2.28.40}\)

=\(\frac{144+144.10+144.56}{360+360.10+360.56}\)

=\(\frac{144\left(1+10+56\right)}{360\left(1+10+56\right)}\)

=\(\frac{144.67}{360.67}\)

=\(\frac{72.2.67}{72.5.67}\)

=\(\frac{2}{5}\)

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

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

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

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

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

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

335574 nha

\(A=\frac{8.15.24...2499}{9.16.25...2500}\)

\(A=\frac{8}{9}.\frac{15}{16}.\frac{24}{25}...\frac{2499}{2500}\)

\(A=\frac{2.4}{3^2}.\frac{3.5}{4^2}.\frac{4.6}{5^2}...\frac{49.51}{50^2}\)

\(A=\frac{\left(2.3.4...49\right).\left(4.5.6...51\right)}{\left(3.4.5...50\right).\left(3.4.5...50\right)}\)

\(A=\frac{2}{50}.\frac{51}{3}\)

\(A=\frac{51}{75}\)

Học tốt nha^^

\(A=\frac{8.15.24...2499}{9.16.25...2500}\)

\(=\frac{8}{9}.\frac{15}{16}.\frac{24}{25}...\frac{2499}{2500}\)

\(=\frac{2.4}{3.3}.\frac{3.5}{4.4}.\frac{4.6}{5.5}...\frac{49.51}{50.50}\)

\(=\frac{2.3.4...49}{3.4.5...50}.\frac{4.5.6...51}{3.4.5...50}\)

\(=\frac{1}{25}.17=\frac{17}{25}\)

Xin lỗi bn nha, mình chưa rút gọn xong.

\(\frac{51}{75}=\frac{17}{25}\)

Học tốt nha^^

2.17.12+2.6.12+8.3.62

=24.17+24.6+24.62

=24.(17+6+62)

=24.85

=2040

\(2.17.12+2.16.12+8.3.62\)

\(=24.17+24.6+24.62\)

\(=24.\left(17+6+62\right)\)

\(=24.85\)

\(=2040\)

2 . 17 . 12 + 2 . 16 . 12 + 8 . 3 . 62

= 24 . 17 + 24 . 16 + 24 . 62

= 24 . (17 + 16 + 62)

= 24 . 85

= 2040

Chúc bạn học tốt!

\(\frac{1.2.3+2.4.6+3.6.9+5.10.15}{1.3.6+2.6.12+3.9.18+5.15.30}\)

\(=\frac{1.2.3.\left(1+2+3+5\right)}{1.3.6.\left(1+2+3+5\right)}\)

\(=\frac{1.2.3.5}{1.3.6.5}\)

\(=\frac{1}{3}\)