Conversion between square kilometers and square kilometers

Kilometer and kilometer are actually the same
Kilometer is a common saying in China. It's a bit of a scientific name

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1. What is the conversion relationship between hectare and mu?
2. 0.5 ha=______ Square meters
3. Three fifths of a ton equals () kg, three fifths of a hectare equals () square meters
4. 5.3 hectares = (how many) square meters?
5. How many hectares is 35000 square meters
6. 1.08 square kilometers equals () square kilometers
7. One hectare is equal to? Square kilometer One hectare is equal to one square kilometer Square kilometer 1 square kilometer = 100 hectares How many square kilometers is a hectare One hundredth of a square kilometer = one hundred hectares How many square kilometers is one hectare equal to 1 square kilometer = 1 kilometer * 1 kilometer = 1000 meters * 1000 meters = 1000000 square meters, 1 hectare = 10000 square meters, so 1 square kilometer is equal to 100 hectares
8. 1 square kilometer = how many ten thousand hectares
9. How many hectares is a square kilometer
10. How many square meters is one hectare?
11. 1+3+5+7+9+11+13+15+17+19…… +2005 = what's the second power
12. 11.35×（-2/3）+1.05×（-2/9）-7.7×（-4/3）
13. Five out of six equals () minutes, nine out of 125 equals () meters, and five out of eight square meters equals () square centimeters
14. 1 + 3 = 4 = 221 + 3 + 5 = 9 = 321 + 3 + 5 + 7 = 16 = 42 1+3+5+7+9+11+13+… +19=______ =______ 2．
15. |How to calculate (1 / 5) - (1 / 7) | + | (1 / 9) - (1 / 7) | + | (1 / 9) - (1 / 11)
16. Calculation: 1 / 3 * 5 + 1 / 5 * 7 + 1 / 7 * 9 + 1 / 9 * 11 + 1 / 11 * 13
17. 1 * 3 * 5 + 3 * 5 * 7 +. + 9 * 11 * 13 = how much,
18. 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
19. 1+3+5+7+9+11+13=（）×（）=（）
20. How many square decimeters is 3 square meters