35+14-26 54-12+28. 47-21+63. 80- 43-17

1.=232.=703.=894.=20

35+14-26 = 49 - 26 = 2454-12+28 = 42 + 28 = 7047-21+63 = 26 + 63 = 8980-43-17 = 37 - 17 = 20