Use the integral multiplication formula to calculate the following questions: (1) 10 and one-third × 9 and two-thirds

(31/3)*(29/3)=(30+1)/3*(30-1)/3=(900-1)/3=899/9

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1. Simplification 27 out of 9; - 30 out of 45
2. 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)
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13. 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)
14. 0.75+(-2 3/4)+(0.125)+(-12 5/7)+(-4
15. X-4 1 = 5 3 8 3 + x = 12 11 X-5 2-7 2 = 5 3 Help me solve these three equations!
16. 81^1/2-(1/8)^-1+3^0=?
17. (0.0081)^-1/4-[3*(7/8)^0]^-1*[81^-0.25+(27/8)^-1/3]^-1/2-10*0.027^1/3=?
18. (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
19. 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
20. Evaluation: 0.125 ^ - 1 / 3 - (- 1 / 2) ^ - 2 + 16 ^ 0