(27/28 - 5/9)-(-1/28 +8 4/9)
= 27/28 - 5/9 + 1/28 - 38/9= (279)/(289) - (528)/(928) + 1/28 - 38/9= 243/252 - 140/252 + 1/28 - 38/9= (243 - 140)/252 + 1/28 - 38/9= 103/252 + 1/28 - 38/9= (1039)/(2529) + (19)/(289) - (3828)/(928)= 927/2268 + 9/252 - 1064/252= (927 + 9 - 1064)/252= -128/252= -32/63
Ответ: -32/63
(27/28 - 5/9)-(-1/28 +8 4/9)
= 27/28 - 5/9 + 1/28 - 38/9
= (279)/(289) - (528)/(928) + 1/28 - 38/9
= 243/252 - 140/252 + 1/28 - 38/9
= (243 - 140)/252 + 1/28 - 38/9
= 103/252 + 1/28 - 38/9
= (1039)/(2529) + (19)/(289) - (3828)/(928)
= 927/2268 + 9/252 - 1064/252
= (927 + 9 - 1064)/252
= -128/252
= -32/63
Ответ: -32/63