Topic content:
Point A and B are the corresponding points on the number axis of numbers - 3 and - 12 respectively. Move line AB to A ′ B ′ along the number axis to the right, and the number corresponding to the midpoint of line A ′ B ′ is 3, then the number corresponding to point A ′ is ______, and the distance moved by point A is ______
Best answer:
According to the title.
The midpoint of line AB is 12 × (- 3-12)=- 74.
Moreover, the number corresponding to the midpoint of line A ′ B ′ is 3.
The distance the midpoint moves is 3 - (- 74)=194.
A moves 194.
The value of A 'is - 3+194=74.
So the answer is: 74194
Answer analysis:
twelve
Test core:
Definition of number axis: a straight line specifying the unique origin, positive direction and unit length is called number axis. The number axis has three elements: origin, positive direction and unit length, which are indispensable. The number axis is a straight line that can extend infinitely to both sides, so all rational numbers can be represented by points on the number axis.