Explanation:
I went through all of them and also checked what you did.
1. no, wrong. I don't know how you got to the 2×7 in there.
17 - 5×4/2 = 17 - 5×2 = 17 - 10 = 7
2. we just did in the other question. it is 26.
3. correct for the approach, but mistake in the final calculation : 28 + 64 = 92 !
4. (4-7)² - 6×7 + 20
how did you get to the 26 for -6×7 + 20 ?
no.
-3² - 42 + 20 = 9 - 42 + 20 = -13
5. 2×(18 - (5 + 3²)/7)
2×(18 - (5 + 9)/7) = 2×(18 - 14/7) = 2×(18 - 2) = 36 - 4 = 32
6. ((-5 + 1)/2)³ - |‐7|
that may part means "absolute value" of -7. and you know, that means 7.
(-4/2)³ - 7 = -2³ - 7 = -8 - 7 = -15
7. 1 + (-2 - 5)² + (14-17)×4
1 + -7² + -3×4 = 1 + 49 - 12 = 38
8. (6×(2+4) - 1) / (2×3 + 1)
(6×6 -1) / (6 + 1) = 35 / 7 = 5
9. (2⁵/8 + 3) / (4 + 3)
(32/8 + 3) / (7) = (4 + 3) / 7 = 7/7 = 1
10. (17×5 - 3×5) / (3² + 1)
(14×5) / (9 + 1) (as for same factors we can contract the expressions like 17×5 - 3×5 = 14×5)
70 / 10 = 7
11. (13 + 7²/7) / (9 - 20/4 - 16)
(13 + 49/7) / (9 - 5 - 16) = (13 + 7) / (-12) = 20/-12 = -5/3
12. - |-16| / ((3² - 4) / (5 - 10))
-16 / ((9-4) / (-5)) = -16 / (5/-5) = -16 / -1 = 16