Question

Tính một cách thuận tiện:

5|12÷2|5- 1|3÷2|5+7|12÷2|5

Answer 1

5/12 : 2/5 - 1/3 : 2/5 + 7/12 : 2/5

= 5/12 x 5/2 - 1/3 x 5/2 + 7/12 x 5/2

= (5/12 - 1/3 + 7/12) x 5/2

= (5/12 + 7/12 - 1/3) x 5/2

= (1 - 1/3) x 5/2

= (3/3 - 1/3) x 5/2

= 2/3 x 5/2

= 5/3

Answer 2

\(\frac{5}{12}\):\(\frac{2}{5}\)-\(\frac{1}{3}\): \(\frac{2}{5}\)+ \(\frac{7}{12}\):\(\frac{2}{5}\)= ( \(\frac{5}{12}\)-\(\frac{1}{3}\)+\(\frac{7}{12}\)) : \(\frac{2}{5}\)

                                                                    = ( \(\frac{1}{12}\)+ \(\frac{7}{12}\)) : \(\frac{2}{5}\)

                                                                    = \(\frac{8}{12}\): \(\frac{2}{5}\)

                                                                    =\(\frac{5}{3}\)