Given 100 points with any 3 points non-aligned. Draw all the line passing through any 2 of these points. How many lines are there?
Given 100 points with any 3 points non-aligned. Draw all the line passing through any 2 of these points. How many lines are there?
Given 100 points with any 3 points non-aligned. Draw all the line passing through any 2 of these points. How many lines are there?
With 100 points, then we draw are:
100 x 99 : 2 = 4950 ( lines )
Answer: 4950 lines
Given 100 points with any 3 points non-aligned. Draw all the line passing through any 2 of these points. How many lines are there?
Đề bài:
Given 100 points with any 3 points non-aligned. Draw all the line passing through any 2 of these points. How many lines are there?
With 100 points, then we draw are:
100 x 99 : 2 = 4950 ( lines )
Answer: 4950 lines
The number of lines is :
\(\frac{100.99}{2}=4950\)
So,...
It is just 1 point in 99 straight draw with 99 points remaining. So with 100 points, with all 99 . 100
As each line is repeated 2 times so have all :
\(\frac{99.100}{2}=4950\)( lines )
Answer : 4950 lines
given 5 points in which not any three points are collinear. Draw lines passing through the pair of points . How many lines are there?
Chọn 1 điểm , làm như vậy với 4 điểm còn lại . ta có 5.4 đt nhưng lại bị lặp 2 làn nên có 5.4:2 = 10 đt
Dịch :
Cho 5 điểm trong đó không có ba điểm thẳng hàng. Vẽ đường thẳng đi qua các cặp điểm . Có bao nhiêu đường thẳng ?
mình cũng ko rõ mình nghĩ là 7 bạn ạ
Given 20 points. Draw the lines through the 2 points of these 20 points. How many lines are there if only 3 of 20 points are aligned?
Nguyễn Cao Cường đã làm đúng nhưng cách giả đâu
Give 5 points which not any three points are collinear. Draw lines passing through the pair of points. How many lines are there?
Given two parallel lines xy & zt. Three points A,B & C are on line xy, two points D & E are on line zt. Draw lines passing through the pairs of points. How many lines are there? (including xy & zt)
Given 20 points. Draw the lines through the 2 points of these 20 points. How many lines are there if only 3 of 20 points are aligned?
Answer: There are ... lines.
Dịch: Cho 20 điểm. Vẽ đường đi qua 2 điểm trong số 20 điểm này. Có bao nhiêu đường nếu chỉ có 3 trong số 20 điểm đó thẳng hàng?
Trả lời: Có ... đường thẳng
True or false
1. we can draw many lines passing through 2 given points
2. we can draw many lines passing through 1 given point
3. we cannot draw any line passing through 3 given points
4. two different lines can only have 1 common point
5. three different lines cannot intersect at 1 point
6. we can draw 3 different lines from 3 collinear points
7. 2 parallel lines may have more than 1 common point
1T
2T
3F
4F
5F
6F
7F
đây hỉ là theo Đ/Án mình thôi nhé
1: F
2: T
3: F
4: F
5: F
6: F
7: F
True or false
1. we can draw many lines passing through 2 given points
2. we can draw many lines passing through 1 given point
3. we cannot draw any line passing through 3 given points
4. two different lines can only have 1 common point
5. three different lines cannot intersect at 1 point
6. we can draw 3 different lines from 3 collinear points
7. 2 parallel lines may have more than 1 common point
1: F
2: T
3: F
4: F
5: F
6: T
7: F