81^1/2-(1/8)^-1+3^0=?

The original formula is 9-8 + 1
=2

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1. X-4 1 = 5 3 8 3 + x = 12 11 X-5 2-7 2 = 5 3 Help me solve these three equations!
2. 0.75+(-2 3/4)+(0.125)+(-12 5/7)+(-4
3. 1/2+(1/3+2/3)+（1/4+2/4+3/4）+···+（1/10+2/10+···9/10） And this (1 + 1 / 2) * (1 + 1 / 4) * (1 + 1 / 6) * · * (1 + 1 / 10) * (1-1 / 3) * (1-1 / 5) * · * (1-1 / 9)
4. 1 + 1 + 2 of 1 + 1 + 2 + 3 of 1 + 1 + 2 + 3 + 4 of 1 + 1+2+3+…… +1 out of 100 = simple calculation, thank you for your help
5. 80.8x10.1-808 thank you,
6. Use the integral multiplication formula to calculate the following questions: (1) 10 and one-third × 9 and two-thirds
7. Simplification 27 out of 9; - 30 out of 45
8. Take off the formula to calculate. (can simple calculate want simple calculate) beg big God urgent 1.4/9 4 / 9 4 / 4 2 8 / 3 / (3 / 8 * 4 / 1) 37 / 2 + 7 / 5 * 25 / 14) / 35 / 34 36x (1 + 4 / 1 + 6 / 1-3 / 1)
9. 1. Three and one eighth × 7.4 - three and one eighth + 3.6 × 3.25 2. Ten and five quarters - (8.8-5 / 7) + 2 / 7 3. 3.14 × 4.3 + 7.2 × 7 / 3-1.5 × 3.14 4、1/2×3+1/2×3+1/3×4…… +1/2010×2011
10. How to simplify the three out of two Be careful
11. (0.0081)^-1/4-[3*(7/8)^0]^-1*[81^-0.25+(27/8)^-1/3]^-1/2-10*0.027^1/3=?
12. (0.0081) ^ - 1 / 4 - [3 * (7 / 8) ^ 0] ^ - 1 * [81 ^ - 0.25 + (27 / 8) ^ - 1 / 3] ^ - 1 / 2-10 * 0.027 ^ 1 / 3 important process
13. The solution proportion: (1) x: 3 / 8 = 2 / 3: 4 (2) x: 6 = 2 / 7 (3) x: 0.3 = 0.4:0.8 (4) 1.75 = 6 / 6 x
14. Evaluation: 0.125 ^ - 1 / 3 - (- 1 / 2) ^ - 2 + 16 ^ 0
15. (3 + 1) (3 ＾ 2 + 1) (3 ＾ 4 + 1) (3 ＾ 8 + 1) (3 ＾ 16 + 1) evaluation
16. To simplify the following ratio: 341:209 3 / 20:7 / 45 11 / 12:5 / 24 6 and 1 / 2:2 / 5 56:84 465:375 14 and 4 / 5:3 and 3 / 7
17. How about 3.24 × 0.16 + 0.0324 × 84?
18. 5×[6.8-（1.6+3.6÷0.9）]÷84．
19. (1.25 + 2.5) × 16 = 1.25 × 3.7 × 0.8 = 3.4 × 9 + 3.4 = 9.24 × 9 + 3.4 = simple calculation
20. (6 out of 7 + 2 out of 5) × 7 × 5, calculated by a simple method