Question

1/2+2/5,1/2-2/5,1/4+1/6,9/10-5/6
Только распишите пожалуйста.

Answer 1

1/2+2/5= 5/10+ 4/10= 9/10;
1/2-2/5= 5/10-4/10= 1/10;
1/4+1/6= 3/12+ 2/12= 5/12;
9/10- 5/6= 27/30- 25/30= 2/30= 1/15.

Answer 2

$frac{1}{2} + frac{2}{5}= frac{5+4}{10} = frac{9}{10}$

$frac{1}{2} - frac{2}{5} = frac{5-4}{10} = frac{1}{10}$

$frac{1}{4}+ frac{1}{6}= frac{6+4}{24} = frac{10}{24}= frac{5}{12}$

$frac{9}{10} - frac{5}{6}= frac{27-25}{30} = frac{2}{30}= frac{1}{15}$