Выполните действия; (3/8-1/9)+25/36; (7/8-13/20)+9/10; (3/4-8/15)+17/20

Question

Выполните действия; (3/8-1/9)+25/36; (7/8-13/20)+9/10; (3/4-8/15)+17/20

Answer 1

(3/8-1/9)+25/36=(27/72-8/72)+50/72=19/72+50/72=69/72=23/24
(7/8-13/20)+9/10=(35/40-26/40)+36/40=9/40+36/40=45/40=9/8=1 1/8
(3/4-8/15)+17/20=(45/60-32/60)+51/60=13/60+51/60=64/60=16/15=1 1/15