Đáp án đúng: ATo find the algebraic expression of the function F from the Karnaugh map, we follow these steps:
1. Identify groups of cells: Observe the Karnaugh map and group the 1s together into the largest possible groups (always powers of 2, i.e., 1, 2, 4, 8, ... cells).
2. Write the expression for each group: For each group, determine which variables retain their value and which variables change. The variables that retain their value will appear in the expression for that group.
3. Combine the expressions: Combine the expressions of the groups together using the OR operation (logical addition).
Analyzing the given Karnaugh map:
* Group 1 (4 cells in the upper left corner): This group includes cells (0, 2, 4, 6). In this group, variable A = 0, variable C = 0. Therefore, the expression of this group is A'C'.
* Group 2 (2 cells in the first row, second and third columns): This group includes cells (2, 3). In this group, variable A = 0, B changes its value, therefore, it does not appear in this group, C = 0. Therefore the expression is A'B'.
* Group 3 (2 cells in the second row, first and second columns): This group includes cells (8, 9). In this group, variable A = 1, B=0, D = 0. Therefore, the expression of this group is AB'D'.
* Group 4 (2 cells in the second row, third and fourth columns): This group includes cells (14, 15). In this group, variable A = 1, B changes its value, therefore, it does not appear in this group, C = 1, D=1. Therefore, the expression of this group is AC.
Combining the expressions, we have: F = A'C' + AB'D' + AC + A'B'. Thus, the simplified expression for F is F = A'C' + A'B' + AB'D' + AC.