The discovery of mathematical formal laws in grade three. - Training Enrollment Network

The discovery of mathematical formal laws in grade three.

s 1 = 2 * 2- 1 * 1 =(2+ 1)(2- 1)= 2+ 1

S2 = 4 * 4-3 * 3+2 * 2- 1 * 1 =(4+3)(4-3)+(2+ 1)(2- 1)= 4+3+2+ 1

S3 = 6 * 6-5 * 5+4 * 4-3 * 3+2 * 2- 1 * 1 =(6+5)(6-5)+(4+3)(4-3)+(2+ 1)(2- 1)= 6+5+4+3+2+ 1

sn=2n+2n- 1+...+6+5+4+3+2+ 1

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