Question

1/4+2/5
2/3+1/4
5/7-1/6
3/4-1/3

Answer 1

1/4+2/5=5/20+8/20=13/20
2/3+1/4=8/12+3/12=11/12
5/7-1/6=30/42-7/42=23/42
3/4-1/3=9/12-4/12=5/12

Answer 2

$frac{1}{4} + frac{2}{5} = frac{5}{20} + frac{8}{20} = frac{13}{20} = 0,65$

$frac{2}{3} + frac{1}{4} = frac{8}{12} + frac{3}{12} = frac{11}{12}$

$frac{5}{7} - frac{1}{6} = frac{30}{42} - frac{7}{42} = frac{23}{42}$

$frac{3}{4} - frac{1}{3} = frac{9}{12} - frac{4}{12} = frac{5}{12}$

Answer 3

не за что