1+3+5+7+9+11+13=（ ）×（ ）=（ ）

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• 1. Study the following series of numbers: 1, - 3, 5, - 7, 9, - 11, 13 According to this rule, the nth number should be () A. 2n-1B. 1-2nC. （2n-1）（-1）nD. （2n-1）（-1）n+1
• 2. 1 * 3 * 5 + 3 * 5 * 7 +. + 9 * 11 * 13 = how much,
• 3. Calculation: 1 / 3 * 5 + 1 / 5 * 7 + 1 / 7 * 9 + 1 / 9 * 11 + 1 / 11 * 13
• 4. |How to calculate (1 / 5) - (1 / 7) | + | (1 / 9) - (1 / 7) | + | (1 / 9) - (1 / 11)
• 5. 1 + 3 = 4 = 221 + 3 + 5 = 9 = 321 + 3 + 5 + 7 = 16 = 42 1+3+5+7+9+11+13+… +19=______ =______ 2．
• 6. Five out of six equals () minutes, nine out of 125 equals () meters, and five out of eight square meters equals () square centimeters
• 7. 11.35×（-2/3）+1.05×（-2/9）-7.7×（-4/3）
• 8. 1+3+5+7+9+11+13+15+17+19…… +2005 = what's the second power
• 9. Conversion between square kilometers and square kilometers
• 10. What is the conversion relationship between hectare and mu?
• 11. How many square decimeters is 3 square meters
• 12. How many square decimeters is 3 square meters equal to
• 13. 60 square meters = () square decimeters
• 14. 17 out of 60 = () 3 out of 10 square meters = () square meters
• 15. 3 square meters 60 square decimeters = () square meters
• 16. 46 cm___ M & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 94 points___ 1060 meters per hour___ Km & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 250 g = -___ Kg 3 square m 5 square decimeter___ Square meters
• 17. 3.8kg = () kg () g 6.08m2 = () m2 () DM2 3.8 kg = () kg () g 6.08 square meters = () square meters () square decimeters
• 18. 3700kg = "t 6050g =" kg 3 yuan 4 jiao = "yuan 865m2 =" M2
• 19. Madame Curie, sentence Madame Curie was the discoverer of radium. But Madame Curie was so tired Who can connect me with related words
• 20. Words to describe Madame Curie's scientific achievements