Q2: The sum of the first k positive integers is equal to k(k+1)/2. What is the sum of the integers from n to m, inclusive , where 0<n<m?
Q3: In triangle ABC, point X is the midpoint of side AC and point Y is the midpoint of side BC. If point R is the midpoint of line segment XC and if point S is the midpoint of line segment YC, what is the area of triangular region RCS ?
條件1: The area of triangular region ABX is 32.
條件2: The length of one of the altitudes of triangle ABC is18
我不懂耶?? 我RCS圖形劃出來，跟ABC圖形 不一樣，請指導我一下謝謝。為什麼條件1能成立呀!
Q4: On a certain transatlantic crossing ,20 percent of a ship’s passengers held round-trip tickets and also took their cars abroad the ship. If 60 percent of the passengers with round-trip tickets did not take their cars abroad the ship, what percent of the ship’s passengers held round-trip tickets?
- 玉米Lv 41 decade agoFavorite Answer
The sum of the first k positive integers is equal to k(k+1)/2
What is the sum of the integers from n to m, inclusive , where 0<n<m?
- 1 decade ago