Answer:
1. 17-5*4/2, 17-20/2, 17-10, 7
2. 40-32/8+5*-2, 40-32/8+(-10),40-4+(-10), 40-14, 26
3. 35-14/2+8^2, 35-14/2+64, 35-7+64, 35-71, -36
4. (4-6)^2-6*7+20, -2^2-6*7+20, 4-6*7+20, 4-42+20, 4-62, -58
5. 2[18-(5+3^2)/7], 2[18-(5+9)/7], 2[18-14/7], 2[18-2], 2[16], 32
6. [(-5+1)/2]^3-|-7|, [(-5+1)/2]^3-7, [-4/2]^3-7, -2^3-7, -8-7, -15
