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(a+b)²=a²+2×a×b×b²

2×a×b=2ab

(X+y)²=x²+2×x×y+y²

(x+a)²=x²+2×x×a+a²

(x+m)²=x²+2×x×m+m²

(x+t)²=x²+2×x×t+t²

(X+k)²=x²+2×x×k+k²

(y+a)²=y²+2×y×a+a²

(x+n)²=x²+2×x×n+n²

(y+t)²=y²2×y×t+t²

(y+c)²=y²+2×y×c+c²

(y+d)²=y²+2×y×d+d²

(y+s)²=y²+2×y×s+s²