Question

2.4+ 5.6*(13 3/4-12 13/14) =

Answer 1

$frac{24}{10} + frac{56}{10}cdot (1 +frac{21-26}{28})=frac{12}{5} + frac{28}{5} cdot (1 -frac{5}{28})=frac{12}{5} + frac{28}{5} cdot frac{28-5}{28}=\ \ =frac{12}{5} + frac{28}{5} cdot frac{23}{28}= frac{12}{5} + frac{23}{5}=frac{35}{5}=7$

Answer 2

1)13 3/4-12 13/14=13 21/28-12 26/28=12 49/28-12 26/28=23/28
2)5 3/5*23/28=28/5*23/28=23/5=4,6
3)2,4+4,6=7