How much is 1 + 2 + 3 added to 100

(1+100)*100/2=50500

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1. Use two methods to write algorithm statements, calculation: 1 + 2 + 3 + +99+100．
2. How much is 1 + 2 + 3 added to 98 + 99 + 100
3. 1 + 2 + 3 + 4 + 5 + 6 + 7 all the way back to 99
4. How much is 1 + 2 + 3 + 4 + 5 added to 100
5. (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
6. (5-5) 45 = 0, (55-10) 45 = 1, (555-15) 45 = 12
7. Is there any difference between approximate number 0.1 and approximate number 0.10? Please give an example
8. 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?
9. Approximate number 1.30 * 10 ^ - 2 accurate to___ position
10. How accurate is the approximate number of 107000?
11. 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9?
12. Complete the following lowercase letters in the order of Hanyu Pinyin alphabet d----g h----j k i-----p q------t
13. 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?
14. The value of arccos (- 1 / 2) is
15. The value of arccos (sin 3 π / 5) is calculated
16. Find the value of arccos (COS 3 π / 4) Please try to give a detailed explanation, I am very stupid!
17. What is the value of arccos (- 11 / 14) - arccos (1 / 7)
18. The value of arccos (sin10)
19. Mathematical right triangle If we know that the perimeter of RT triangle ABC is 4 + 4 times the root sign 3, and the length of the middle line on the hypotenuse is 2, then the area of triangle ABC is (the answer is 8)
20. How can a right triangle with three sides know how to find three angles? For example, how can a right triangle with three sides of 3, 4, and 5 find its angle according to the change?