-9
2/9 minus (negative 8/9) = 2/9 + 8/9 = 10/9
9 and 1
9 and 6/8
8 and 5 over 6
-9
2/9 minus (negative 8/9) = 2/9 + 8/9 = 10/9
9 and 1
9 and 6/8
9 - 8/4 = 7 (9 - 8)/4 = 1/4
8 and 5 over 6
9 subtracted from 40 = -31
13
136 subtracted by 128 = 8
16x subtracted by 25xy = -9
2^2=4, 4 - 1=3, 3^2 = 9, 9 - 1= 8, 8^2= 64, 64 - 1= 63. So its the first number squared, then subtracted by 1, then that number is squared, then subtracted by 1, etc.
8/5 - 4/9 = 72/45 - 20/45 = 52/45 = 1 7/45