作业帮已知xy=¼,则(x+y)²-(x-y)²的值为
来源：学生作业帮助网 编辑：作业帮 时间：2024/09/08 05:25:21
x){}K+*mՔ
-,uvԨЮr-u5*taZ6ycMR>Y lȷ"mmTQ] W %5!M**5 M6yvPڀ9$ ӭDm+ D
已知xy=¼,则(x+y)²-(x-y)²的值为
已知xy=¼,则(x+y)²-(x-y)²的值为
已知xy=¼,则(x+y)²-(x-y)²的值为
(x+y)²-(x-y)²
=x²+2xy+y²-(x²+y²-2xy)
=4xy
=4×(1/4)
=1
(x+y)²-(x-y)²
=x²+2xy+y²-x²-y²+2xy
=4xy
=4×(1/4)
=1