Question

17/21*48/53+17/21*4/53+52/53*4/21

Làm giúp mik với nha

Answer 1

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

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

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

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

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

Answer 2

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

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

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

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

= \(\frac{52}{53}\)