Hard Arithmetic Puzzles

#38: 1 _ 2 _ 4 _ 9 = 11 hard #39: 1 _ 2 _ 4 _ 9 = -7 hard #43: 1 _ 2 _ 5 _ 8 = 20 hard #56: 1 _ 2 _ 6 _ 9 = 12 hard #67: 1 _ 2 _ 8 _ 4 = 16 hard #69: 1 _ 2 _ 8 _ 5 = 20 hard #75: 1 _ 2 _ 8 _ 9 = 13 hard #84: 1 _ 2 _ 9 _ 4 = 18 hard #120: 1 _ 3 _ 6 _ 8 = 16 hard #121: 1 _ 3 _ 6 _ 9 = 11 hard #122: 1 _ 3 _ 6 _ 9 = -7 hard #133: 1 _ 3 _ 8 _ 6 = 16 hard #146: 1 _ 3 _ 9 _ 5 = 15 hard #150: 1 _ 3 _ 9 _ 8 = 11 hard #152: 1 _ 3 _ 9 _ 9 = 12 hard #157: 1 _ 4 _ 2 _ 9 = 19 hard #168: 1 _ 4 _ 3 _ 9 = 13 hard #194: 1 _ 4 _ 7 _ 2 = 15 hard #197: 1 _ 4 _ 8 _ 2 = 17 hard #203: 1 _ 4 _ 8 _ 2 = 16 hard #218: 1 _ 4 _ 8 _ 8 = 16 hard #219: 1 _ 4 _ 8 _ 9 = 11 hard #220: 1 _ 4 _ 8 _ 9 = -7 hard #221: 1 _ 4 _ 8 _ 9 = 18 hard #222: 1 _ 4 _ 9 _ 2 = 19 hard #223: 1 _ 4 _ 9 _ 3 = 13 hard #228: 1 _ 4 _ 9 _ 2 = 18 hard #231: 1 _ 4 _ 9 _ 8 = 18 hard #236: 1 _ 5 _ 2 _ 8 = 20 hard #238: 1 _ 5 _ 3 _ 9 = 16 hard #241: 1 _ 5 _ 3 _ 9 = 15 hard #244: 1 _ 5 _ 4 _ 8 = -9 hard #256: 1 _ 5 _ 8 _ 4 = -9 hard #262: 1 _ 5 _ 8 _ 2 = 20 hard #263: 1 _ 5 _ 9 _ 3 = 16 hard #265: 1 _ 5 _ 9 _ 3 = 15 hard #276: 1 _ 6 _ 2 _ 9 = 12 hard #282: 1 _ 6 _ 3 _ 7 = 15 hard #298: 1 _ 6 _ 3 _ 8 = 16 hard #299: 1 _ 6 _ 3 _ 9 = 11 hard #300: 1 _ 6 _ 3 _ 9 = -7 hard #305: 1 _ 6 _ 4 _ 8 = 13 hard #322: 1 _ 6 _ 7 _ 3 = 15 hard #325: 1 _ 6 _ 8 _ 4 = 13 hard #331: 1 _ 6 _ 8 _ 3 = 16 hard #345: 1 _ 7 _ 4 _ 8 = 15 hard #349: 1 _ 7 _ 6 _ 3 = 15 hard #354: 1 _ 7 _ 8 _ 4 = 15 hard