Task list filter?

Choose required ranks and required tasks. The table of contents will list only tasks having one of the required ranks in corresponding rankings and at least one of the required tags (overall). If you wish to filter only according to some rankings or tags, leave the other groups empty.

Task rankings

Difficulty level

Task tags

Task type
«
«
«

Matrix equation

Task number: 2485

Find a matrix A, that over Z5 satisfies

A(4401312223133234)=(1023312223131234)

  • Hint

    From AB=C express A.

  • Resolution

    A=CB1=(1023312223131234)(4401312223133234)1=(1023312223131234)(4143413034304223)

  • Result

    A=(2012010000102320)

Difficulty level: Easy task (using definitions and simple reasoning)
Solution require uncommon idea
Cs translation
Send comment on task by email