5. (3 points) The figure is a quadrilateral composed of 18 small equilateral triangles of the same size. Some adjacent small equilateral triangles can form several larger equilateral triangles. Therefore, the number of large and small equilateral triangles containing the “**” mark in the figure is .



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5. (3 points) The figure is a quadrilateral composed of 18 small equilateral triangles of the same size. Some adjacent small equilateral triangles can form several larger equilateral triangles. Therefore, the number of large and small equilateral triangles containing “*” in the figure is 6.
【Solution】Solution: Observing the figure, we can see that there is 1 equilateral triangle with a side length of 1 containing “*”, 4 equilateral triangles with a side length of 2, and 1 equilateral triangle with a side length of 3,
So $1+4+1=6$ (triangles).
Therefore, the answer is: 6.