若(x-y)²=7,(x+y)²=5,则x²+y²=?最好有个步骤,
来源:学生作业帮助网 编辑:六六作业网 时间:2024/12/26 09:26:57
若(x-y)²=7,(x+y)²=5,则x²+y²=?最好有个步骤,若(x-y)²=7,(x+y)²=5,则x²+y²=
若(x-y)²=7,(x+y)²=5,则x²+y²=?最好有个步骤,
若(x-y)²=7,(x+y)²=5,则x²+y²=?最好有个步骤,
若(x-y)²=7,(x+y)²=5,则x²+y²=?最好有个步骤,