Research Space for Linear Algebra & Discrete Mathematics
令 a = 1+2+...+k, b = k+1, a^2 + 2ab + b^2 = (a+b)^2
一點就通~~感謝囉~
想問一下畫紅線的地方怎麼化簡的??
令 a = 1+2+...+k, b = k+1,
回覆刪除a^2 + 2ab + b^2 = (a+b)^2
一點就通~~
回覆刪除感謝囉~