乘法公式运算:(x+y+1)(x+y-1)

来源:学生作业帮助网 编辑:六六作业网 时间:2024/10/04 16:55:31
乘法公式运算:(x+y+1)(x+y-1)乘法公式运算:(x+y+1)(x+y-1)乘法公式运算:(x+y+1)(x+y-1)(x+y+1)(x+y-1)=(x+y)²-1=x²+

乘法公式运算:(x+y+1)(x+y-1)
乘法公式运算:(x+y+1)(x+y-1)

乘法公式运算:(x+y+1)(x+y-1)
(x+y+1)(x+y-1)
=(x+y)²-1
=x²+2xy+y²-1

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

啥意思?