a) 76/7 - 513/56 = 736/56 - 513/56 = (736 - 513)/56 = 223/56
б) 57/8 + 25/12 = (573 + 252)/24 = (171 + 50)/24 = 221/24
в) 5 - 5/7 = 35/7 - 5/7 = (35 - 5)/7 = 30/7
г) 12 - 23/4 = 48/4 - 23/4 = (48 - 23)/4 = 25/4
д) 12 - 23/4 + (31/2 - 13/8) = 12 - 23/4 + 31/2 - 13/8= 12 - 23/4 + 31/2 - 13/8= 12 - 92/8 + 124/8 - 13/8= 12 + 32/8 - 11/8= 12 + 4 - 1= 15
a) 76/7 - 513/56 = 736/56 - 513/56 = (736 - 513)/56 = 223/56
б) 57/8 + 25/12 = (573 + 252)/24 = (171 + 50)/24 = 221/24
в) 5 - 5/7 = 35/7 - 5/7 = (35 - 5)/7 = 30/7
г) 12 - 23/4 = 48/4 - 23/4 = (48 - 23)/4 = 25/4
д) 12 - 23/4 + (31/2 - 13/8) = 12 - 23/4 + 31/2 - 13/8
= 12 - 23/4 + 31/2 - 13/8
= 12 - 92/8 + 124/8 - 13/8
= 12 + 32/8 - 11/8
= 12 + 4 - 1
= 15