Fermi
·
Concept Library
·
Courses
·
Books
·
Problems
·
Simulations
·
Math Wiki
·
High School
Fermi
›
Problems
Mathematics
Mathematics
Problem
Calculate efficiently.
5
1
2
⋅
20
−
2
1
2
⋅
20
−
1
1
5
⋅
20
5\frac{1}{2} \cdot 20 - 2\frac{1}{2} \cdot 20 - 1\frac{1}{5} \cdot 20
5
2
1
⋅
20
−
2
2
1
⋅
20
−
1
5
1
⋅
20
Browse the problem library