How much is 1 + 2 + 3 added to 98 + 99 + 100

five thousand and five hundred

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1. 1 + 2 + 3 + 4 + 5 + 6 + 7 all the way back to 99
2. How much is 1 + 2 + 3 + 4 + 5 added to 100
3. (5-5) / 45 = 0 (55-10) / 45 = 0 (555-15) / 45 = 12 (5555-20) / 45 = 123 (55555-25) / 45 = 1234 a group of such examples are recommended
4. (5-5) 45 = 0, (55-10) 45 = 1, (555-15) 45 = 12
5. Is there any difference between approximate number 0.1 and approximate number 0.10? Please give an example
6. A question about approximate number. There is an approximate number: "1.2 × 10 ∧ 4". Question: which digit is it accurate to? I think there are two kinds of answers: 1. If you only look at 1.2 (because you only look at 1.2 when you look at the significant number), then it is accurate to the tenth digit; 2. If you write this number as 12000, then it is accurate to the thousand digit; is the correct answer 1 or 2, or something else?
7. Approximate number 1.30 * 10 ^ - 2 accurate to___ position
8. How accurate is the approximate number of 107000?
9. 1、2、3…… The 20 numbers are divided into 4 groups, 5 in each group. It is proved that the sum of 5 numbers in one group is greater than 52 Give reasons
10. It is proved that from the first 15 odd numbers 1, 3 and 5-29, if you take any 9 numbers, the sum of two numbers must be 52
11. Use two methods to write algorithm statements, calculation: 1 + 2 + 3 + +99+100．
12. How much is 1 + 2 + 3 added to 100
13. 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9?
14. Complete the following lowercase letters in the order of Hanyu Pinyin alphabet d----g h----j k i-----p q------t
15. Use calculator to calculate, please complete the table below 3 & # 185; 3 & # 178; 3 & # 179; 3 fourth power, 3 fifth power, 3 sixth power, 3 seventh power, 3 eighth power 3 9 27 81 243 729 2187 6561 From the table, what's the rule of the single digit of the power of 3? What's the single digit of the power of 3 225? Why?
16. The value of arccos (- 1 / 2) is
17. The value of arccos (sin 3 π / 5) is calculated
18. Find the value of arccos (COS 3 π / 4) Please try to give a detailed explanation, I am very stupid!
19. What is the value of arccos (- 11 / 14) - arccos (1 / 7)
20. The value of arccos (sin10)