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\(\frac{17}{21}\times\frac{2}{5}+\frac{17}{21}\times\frac{17}{21}\times\frac{3}{5}\)

\(=\frac{17}{21}\times\left(\frac{2}{5}+\frac{3}{5}\right)\)

\(=\frac{17}{21}\times1\)

\(=\frac{17}{21}\)

Đề bài hơi kì. Bạn kiểm tra lại xem có sai chỗ nào ko v?

= 17/21 * (3/5 + 2/5)

= 17/21 * 5/5

= 17/21 * 1

= 17/21

Học tốt nha!

=17/21 x 3/5 + 17/ 21 x 2/5

= 17/ 21 x ( 3/5 + 2/5 )
=  17/ 21x     1

= 17/21

Hok tốt !!!

kết quả là 64/105

3/17 x 4/21 + 3/17 x 25/21 - 8/21 x 3/17 = 3/17 x ( 4/21 + 25/21 - 8) = 3/17 x 1= 3/17

\(\frac{3}{17}.\frac{4}{21}+\frac{3}{17}.\frac{25}{21}-\frac{8}{21}.\frac{3}{17}\)

\(=\frac{3}{17}\left(\frac{4}{21}+\frac{25}{21}-\frac{8}{21}\right)\)

\(=\frac{3}{17}.1\)

\(=\frac{3}{17}\)

9/21+7/15+8/17+17/21+23/15

=(9/21+17/21)+(7/15+23/15)+8/17

=26/21+2+8/17

=68/21+8/17

=1324/357

9/21+7/15+8/17+17/21+23/15

(9/21+17/21)+(7/15+23/15)+8/17

26/21+30/15+8/17

đề pạn ghi có vấn đề r coi lại đi 

\(\frac{17}{21}\cdot\frac{48}{53}+\frac{17}{21}\cdot\frac{4}{53}+\frac{52}{53}\cdot\frac{4}{21}\)

\(=\frac{17}{21}\left(\frac{48}{53}+\frac{4}{53}\right)+\frac{52}{53}\cdot\frac{4}{21}\)

\(=\frac{17}{21}\cdot\frac{52}{53}+\frac{52}{53}\cdot\frac{4}{21}\)

\(=\frac{52}{53}\left(\frac{17}{21}+\frac{4}{21}\right)\)

\(=\frac{52}{53}\cdot1\)

\(\frac{17}{21}.\frac{48}{53}+\frac{17}{21}.\frac{4}{53}+\frac{52}{53}.\frac{4}{21}\)

= \(\frac{17}{21}.\left(\frac{48}{53}+\frac{4}{53}\right)+\frac{52}{53}.\frac{4}{21}\)

= \(\frac{17}{21}.\frac{52}{53}+\frac{52}{53}.\frac{4}{21}\)

=\(\frac{52}{53}.\left(\frac{17}{21}+\frac{4}{21}\right)\)

= \(\frac{52}{53}\)

ai choi free fire ket bn ik

6/21; 7/21; 8/21; 9/21; 10/21; 11/21; 12/21; 13/21; 14/21; 15/21; 16/21