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Who can explain what is the answer to the math fill-in-the-blank question in the 20 12 Huzhou senior high school entrance examination?
First, observe the change of the number of small triangles in each row of the largest regular triangle.

The first line: 1

Line 2: Line 3

Line 3: Line 5

. . . . . .

Line n: 2n- 1

Then, the number of small triangles in the largest regular triangle is n * n

And it is easy to find that black diamonds also conform to this law. Then we can assume that it has 2m rows of small regular triangles, and the total number should be 2 m * m.