Tính bằng cách thuận tiện: 4/5 + 2/10 − 1/3 − 10/15 = 4/5 + . . . . . . . . . . − 1/3 − . . . . . . . . . . = ( 4/5 + . . . . . . . . . . ) − ( 1/3 + . . . . . . . . . . ) = . . . . . . . .
Giải thích
Lời giải
\[\frac{4}{5} + \frac{2}{{10}} - \frac{1}{3} - \frac{{10}}{{15}}\]
\[ = \frac{4}{5} + \frac{1}{5} - \frac{1}{3} - \frac{2}{3}\]
\[ = \left( {\frac{4}{5} + \frac{1}{5}} \right) - \left( {\frac{1}{3} + \frac{2}{3}} \right)\]
\[ = \frac{5}{5} - \frac{3}{3}\]
= 1 – 1
= 0