Întrebare Clasă: Education Materie: matematica scrieti suma primilor 20 de termeni a unei progresii aritmetice, daca: a1=2; r= 3 Întrebare a fost pusă de: USER8688 81 Vezi 81 Răspunsuri Răspuns (81) USER4529 Cel mai bun răspuns (103) Sn = [2a1 + (n-1)r] × n/2S20 = [2×2 + (20 - 1)×3]×20/2 = (4 + 19×3)×10= (4 + 57)×10 = 61×10 = 610 Vezi alte răspunsuri (81) Articole relevante Question 5: How does Outlook 2016 handle duplicate emails? 31 Agustus 2025 58 Vezi 58 comentarii Why is my HP printer not connecting to Wi-Fi? 31 Agustus 2025 45 Vezi 45 comentarii Question 4: Can you create custom labels in Outlook 2016 to categorize emails? 31 Agustus 2025 78 Vezi 78 comentarii My HP printer is printing blurry or faded images. How do I fix it? 31 Agustus 2025 66 Vezi 66 comentarii What does Canon Printer Error Code 1300 typically indicate? 31 Agustus 2025 59 Vezi 59 comentarii How can I resolve paper jam issues on my HP printer? 31 Agustus 2025 52 Vezi 52 comentarii Question 2: How does Outlook 2016 handle different email formats (e.g., HTML, plain text)? 31 Agustus 2025 90 Vezi 90 comentarii What should I do if my HP printer is printing blank pages? 31 Agustus 2025 58 Vezi 58 comentarii What are some common mistakes that contribute to Error Code 1300? 31 Agustus 2025 65 Vezi 65 comentarii Could a problem with the printer's paper feed motor be the cause of Error Code 1300? 31 Agustus 2025 84 Vezi 84 comentarii My Canon printer is displaying Error Code 1300 after a paper jam. What should be my first action? 31 Agustus 2025 97 Vezi 97 comentarii Question 10: What are some advanced indexing options available in Outlook 2016? 31 Agustus 2025 79 Vezi 79 comentarii How can I prevent Error Code 1300 from occurring on my Canon printer? 31 Agustus 2025 69 Vezi 69 comentarii If my appeal is rejected, can I appeal again? 31 Agustus 2025 45 Vezi 45 comentarii Alexandru are o Colectie de 15masini. Iar Cristian daca ar mai adauga 3 masini La colectia sa, ar avea de4 ori mai multe Decat alexandru cate masini are cristian 31 Agustus 2025 160 Vezi 162 comentarii My Canon PIXMA E510 is showing an error code. Will resetting the printer fix it? 29 Agustus 2025 80 Vezi 80 comentarii The congruent sides of an isosceles triangle are each 1 unit longer than the length of the shortest side of the triangle. The perimeter of the triangle is the same as the perimeter of a square whose side length is 2 units shorter than the length of the shortest side of the triangle. What is the length of the shortest side of the triangle? 29 Agustus 2025 160 Vezi 340 comentarii care sunt sensurile cuvantului tarina 26 Agustus 2025 38 Vezi 38 comentarii