140
The answer of 17 + 123 is 140 and then minus 50 is 90
-40 - 90 = -130
5/9 - 1/10 ---> 50/90 - 9/90 = 41/90 ≈ 0,46
90 - 90 = 0
90.
30 minus 90 is negative 60, if I'm correct.
910 minus 50 is 860.
45 minus -50 is 95.
0.2 minus 50 is -49.8
90/5 = 1818/2 = 9
90 - 6 = 84