Question

1 2/5*2 5/7-1 2/5*3/14=

Answer 1

1 2/5*2 5/7-1 2/5*3/14=7/5*19/7-7/5*3/14=133/35-21/70=266/70-21/70=245/70=3,5

Answer 2

$1frac{2}{5}cdot2frac{5}{7}-1frac{2}{5}cdotfrac{3}{14}=3frac{1}{2}=3,5$

 

1) $1frac{2}{5}cdot2frac{5}{7}=frac{7}{5}cdotfrac{19}{7}=frac{19}{5}=3frac{4}{5}=3,8$

 

2) $1frac{2}{5}cdotfrac{3}{14}=frac{7}{5}cdotfrac{3}{14}=frac{3}{10}=0,3$

 

3) $3,8-0,3=3,5$