Question

1. Выполните действия :
а) 13/15 - 11/15 + 9/15 =
б) 9/40 + 8/40 - 10/40=

Answer 1

а) 13/15-11/15+9/15=11/15
б) 9/40+8/40-10/40=7/40

Answer 2

$a)\frac{13}{15}-\frac{11}{15}+\frac{9}{15} =\frac{13-11+9}{15}=\frac{11}{15}$
$b)\frac{9}{40}+\frac{8}{40}-\frac{10}{40}=\frac{9+8-10}{40}=\frac{7}{40}$