2/3 *  10/21 * 3/2 = (2/3 * 3/2) * 10/21 = 1 * 10/21 = 10/21

22/5 * 12 * 5/12 = 22/5 * (12 * 5/12) = 22/5 * 5 =22

7/2 * 28/81 * 2/7= (7/2 * 2/7) * 28/81 = 1 * 28/81 =28/81

5/17 * 21/4 * 47/15 * 0 = 0

~Study well~

#Seok_Jin#

ARE YOU KOREAN ???

\(\frac{2}{3}\times\frac{10}{21}\times\frac{3}{2}\)

\(=\left(\frac{2}{3}\times\frac{3}{2}\right)\times\frac{10}{21}\)

\(=\left(\frac{1}{1}\times\frac{1}{1}\right)\times\frac{10}{21}\)

\(=1\times\frac{10}{21}\)

\(=\frac{10}{21}\)

bn ơi hình như sai đề rồi , số cuối cùng là 17/72

= 17/7 + 4/7 - 2/5 + 3/5

= 21/7 - 5/5

= 3 - 1

= 2

\(\frac{9}{5}:\frac{17}{15}+\frac{8}{5}:\frac{17}{15}\)

\(=\frac{17}{15}:\left(\frac{9}{5}+\frac{8}{5}\right)\)

\(=\frac{17}{15}:3\)

\(=\frac{17}{45}\)

\(\frac{9}{5}:\frac{17}{15}+\frac{8}{5}:\frac{17}{5}=\frac{9}{5}.\frac{15}{17}+\frac{8}{5}.\frac{15}{17}=\frac{15}{17}\left(\frac{9}{5}+\frac{8}{5}\right)=\frac{15}{17}.\frac{17}{5}=3\)

   9/5 : 17/15 + 8/5 : 17/15

= ( 9/5 + 8/5 ) x 15/17

= 17/5 x 15/17

= 3

\(a,\dfrac{5}{9}\times\dfrac{5}{2}+\dfrac{4}{9}\times\dfrac{5}{2}=\dfrac{5}{2}\times\left(\dfrac{5}{9}+\dfrac{4}{9}\right)=\dfrac{5}{2}\times1=\dfrac{5}{2}\)

\(12\times\dfrac{3}{4}-\dfrac{3}{4}\times\dfrac{12}{7}=\dfrac{3}{4}\times\left(12-\dfrac{12}{7}\right)=\dfrac{3}{4}\times\dfrac{72}{7}=\dfrac{54}{7}\)

=3x2/3 x 2/4

=2x1/2

=1

=1

k cko mik nha mái pn