问题
选择题
| 要使等式（x-y）2+m=（x+y）2成立，代数式m应是( ) |
| A．2xy B．4xy C．-4xy D．-2xy |
答案
答案：B
搜题请搜索小程序“爱下问搜题”
| 要使等式（x-y）2+m=（x+y）2成立，代数式m应是( ) |
| A．2xy B．4xy C．-4xy D．-2xy |
答案：B
| 选择方框内适当的词，并用其适当形式填空。 | |
2．I hear Sarah lives on the _______ floor of this tall building. 3．Your daughter is so young that you can't leave her at home by _______. 4．Huang Yue's father is the _______ of this shop. 5．Use "might" or "could" to show that you think something is _______ true. |