If you mean: -9-10+8 then their sum is -11
The mean (or average) of 8, 9, and 10 is 9.
8 and 9/10 = 89/10
10 minus 9/8 is 8 7/8
10*8/9 = 80/9 = 88/9
It depends: 7/8/9/10 can be: 7/(8/(9/10)) = 7/(80/9) = 63/80, or 7/((8/9)/10) = 7/(8/90) = 7/(4/45) = 315/4 (7/8)/(9/10) = 70/72 = 35/36 (7/(8/9))/10 = (63/8)/10 = 63/80 ((7/8)/9)/10 = (7/72)/10 = 7/720 * * * * * There is an "and" between 8 and 9 so the question, in fact, refers to 7/8 + 9/10 which is not ambiguous. 7/8 + 9/10 = 35/40 + 36/40 = 71/40 = 1 and 31/40
7/8 is smaller than 9/10. 7/8 = .875 whereas 9/10 = .9
10+9-8-7+6 = 10
(8/15) / (9/10) = (8/15) x (10/9) = (8/3) x (2/9) = 16/27
5+5-2 9-9+8 10-1-1 0+0+8 -8+8+8 9+9-10 10-6+4
(3 / 8) / (9 / 10) = 0.416666667
A Pullip can take a 8-9 and 9-10 or 9/10 and 8/9. They fit a 8-9 slightly tight a 9 is perfect! but a 9-10 would fit but it is to big.
19 o'clock is is the UK version of 7.pm