Question

Tính bằng cách thuận tiện nhất:

\(\frac{19}{15}+\frac{31}{23}-\frac{4}{15}-\frac{8}{23}\)

Answer 1

\(\frac{19}{15}+\frac{31}{23}-\frac{4}{15}-\frac{8}{23}\)

\(=\left(\frac{19}{15}-\frac{4}{15}\right)+\left(\frac{31}{23}-\frac{8}{23}\right)\)

\(=\frac{15}{15}+\frac{23}{23}\)

\(=1+1=2\)

Answer 2

\(\frac{19}{15}+\frac{31}{23}-\frac{14}{15}-\frac{8}{23}\)

\(=\frac{19}{15}-\frac{4}{15}+\frac{31}{23}-\frac{8}{23}\)

\(=1+1=2\)

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Answer 3

19 / 15 + 31 / 25 - 4 / 15 - 8 / 23

= ( 19 / 15 - 4 / 15 ) + ( 31 / 23 - 8 / 23 )

= 15 / 15 + 23 / 23

= 1 + 1 = 2