Training Enrollment Network
Early education courses
Mathematics courses
Education and training
Books and materials
Current location -
Training Enrollment Network
-
Mathematics courses
- The first volume of the seventh grade practices math answers synchronously.
The first volume of the seventh grade practices math answers synchronously.
Suppose A X is old and B 50-X. According to the topic, A is older. When a is 50-x, a is backward. X-(50-x)=2x-50 years old, then B is 50-x-(2x-50)= 100-3x.
50-x=2( 100-3x) x=30, so A 30 B 20.
Related articles
Unreasonable mathematics
First-grade mathematics entertainment
Summary | What have I gained as a calligraphy teaching assistant?
What is a shape with only one axis of symmetry?
(20 12? Some of the X and Y chromosomes of Drosophila melanogaster are homologous fragments (such as fragment I in IN). The other part is a non-homologous fragment (in).
How to draw the mind map of Unit 4 of Mathematics in Senior One?
A painting suitable for the first grade of primary school
[Exploration on Teaching Practice of Mathematics Module in Vocational School] Basic Mathematics Module in Secondary Vocational School
Excerpts from famous sayings and sentences
Amc8 exam time