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

Solution 1, 3 / 8 * 2 / 3 = 4x 4x = 1 / 4, x = 1 / 16
Solution 2, 6 * 7 = 2x, 2x = 42, x = 21
Solution 3, 0.8x = 0.3 * 0.4, 0.8x = 0.12, x = 0.15
Solution 4, 1.5x = 0.75 * 6, 1.5x = 4.5X = 3

RELATED INFORMATIONS

1. (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
2. (0.0081)^-1/4-[3*(7/8)^0]^-1*[81^-0.25+(27/8)^-1/3]^-1/2-10*0.027^1/3=?
3. 81^1/2-(1/8)^-1+3^0=?
4. X-4 1 = 5 3 8 3 + x = 12 11 X-5 2-7 2 = 5 3 Help me solve these three equations!
5. 0.75+(-2 3/4)+(0.125)+(-12 5/7)+(-4
6. 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)
7. 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
8. 80.8x10.1-808 thank you,
9. Use the integral multiplication formula to calculate the following questions: (1) 10 and one-third × 9 and two-thirds
10. Simplification 27 out of 9; - 30 out of 45
11. Evaluation: 0.125 ^ - 1 / 3 - (- 1 / 2) ^ - 2 + 16 ^ 0
12. (3 + 1) (3 ＾ 2 + 1) (3 ＾ 4 + 1) (3 ＾ 8 + 1) (3 ＾ 16 + 1) evaluation
13. 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
14. How about 3.24 × 0.16 + 0.0324 × 84?
15. 5×[6.8-（1.6+3.6÷0.9）]÷84．
16. (1.25 + 2.5) × 16 = 1.25 × 3.7 × 0.8 = 3.4 × 9 + 3.4 = 9.24 × 9 + 3.4 = simple calculation
17. (6 out of 7 + 2 out of 5) × 7 × 5, calculated by a simple method
18. The ratio is 3.75:2.5 2 / 3:1 / 4
19. To calculate the ratio, the formula is 0.52:1.3, 2:12:7, and the simple ratio is 1.25:2.5, 4:0.125
20. 5 / 8 ton: 750 kg ratio 1.2:5 / 4 ratio 2.5 meter: 50 cm ratio