Can 0.6:4 and 9 / 5:2.4 make up the proportion

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• 1. Can 0.2, 0.4, 0.6, four fifths form a proportion? Write the proportion as well~ What about two-thirds, five sixths, 15 and 12?
• 2. The formula is 0.25, three fifths, one eighth and six fifths
• 3. How about 34 times 5 / 11 times 1 / 10 times 11 / 51
• 4. 1 + 3 + 5 + 7 + 9 +... + 99 + 101 should be simple
• 5. 1 + 3 = 22 = 4, 1 + 3 + 5 = 32 = 9, 1 + 3 + 5 + 7 = 42 = 16, then, 1 + 3 + 5 + 7 + 9 + +99=______ ．
• 6. 1 × 2 / 1 + 2 × 3 / 1 + 3 × 4 / 1 + +1 / 99 × 101=
• 7. 1 / 1 + 2 + 1 / 1 + 2 + 3 + 1 / 1 + 2 + 3 + 4 + ellipsis + 1 / 1 + 2 + ellipsis + 99
• 8. 1×3×5×7×9×11×13×… X 99
• 9. 1+3+5+7+9+11+13+15+… +99
• 10. 0.1+0.3+0.5+0.7+0.9+0.11+0.13+…… +0.99 Simple calculation
• 11. The ratio of 3, 0.2, three fifths and 9 is ()
• 12. Use the following four numbers to make up the proportion and see how many? 1.6, 1 / 5, 0.8, six and two fifths
• 13. Can the four numbers 6, 8, 9 and 12 form a proportion? Please write different proportion formulas?
• 14. If 4, 8, 9 and X can form a proportional expression, what numbers can x take
• 15. What are the two ratios with a ratio of 4? What is the composition ratio?
• 16. The meaning of proportion write two ratios are 0.8 ratio, and form proportion ()
• 17. Write two ratios of 5 and make up the ratio It's ten percent faster,
• 18. Write two ratios that are 3 / 8 and put them in proportion
• 19. Write the ratio is the ratio of 0.5______ ．
• 20. Write two ratios of 0.6 and make up the proportion. Write the proportion formula