Выполните действия: (7/8 - 13/20)+ 9/10; (3/4 - 8/15)+17/20

Question

Выполните действия: (7/8 - 13/20)+ 9/10; (3/4 - 8/15)+17/20

Answer 1

(7/8 - 13/20)+ 9/10 = 35/40 - 26/40 + 36/40 = 45/40 = 1,125;
(3/4 - 8/15)+ 17/20 = 45/60 - 32/60 + 51/60 = 64/60 = 1 1/15;