а) (300-1/6)+7/12 = (299 6/6 - 1/6) + 7/12 = 299 5/6 + 7/12 = 299 (10+7)/12 =
= 299 17/12 = 300 5/12
б) 2 13/30-(1 1/10+1/5) = 2 13/30 - 1 (1+2)/10 = 2 13/30 - 1 3/10 =
= 1 (13-9)/30 = 1 4/30 = 1 2/15
а) x-6 3/8=3 5/7 х = 3 5/7 + 6 3/8 = 9 (40+21)/56 = 9 61/56 = 10 5/56
х=10 5/56
б) 35 22/63+x=40 1/9 х = 40 1/9 - 35 22/63 = 5 (7-22)/63 =
= 4 (63+7-22)/63 = 4 48/63 = 4 16/21
х=4 16/21