整式乘法公式(x+y+1) (x-y+1)

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整式乘法公式(x+y+1)(x-y+1)整式乘法公式(x+y+1)(x-y+1)整式乘法公式(x+y+1)(x-y+1)(x+y+1)(x-y+1)=[(x+1)+y][(x+1)-y]=(x+1)^

整式乘法公式(x+y+1) (x-y+1)
整式乘法公式
(x+y+1) (x-y+1)

整式乘法公式(x+y+1) (x-y+1)
(x+y+1) (x-y+1)
=[(x+1)+y][(x+1)-y]
=(x+1)^2-y^2
=x^2+2x+1-y^2

(x+y+1) (x-y+1)
=[(x+1)+y][(x+1)-y]
=(x+1)^2-y^2
=x^2+2x+1-y^2

(x+y+1) (x-y+1)
=[(x+1)+y][(x+1)-y]
=(x+1)²-y²
=x²+2x+1-y²

(x+y+1) (x-y+1)=(x+1+y) (x+1-y)=(x+1)^2-y^2