当整数k=______时,多项式x2+4kx+16恰好使另一个多项式的平方.
x2+4kx+16=x2±2×4×x+42,
∴4k=±2×4,
∴k=±2.
故答案为:±2.
营养性缺铁性贫血的有效治疗药物是
A.硫酸亚铁加维生素C
B.叶酸加维生素B12:
C.服枸橼酸铁胺
D.肌注右旋糖酐铁
E.反复多次输血
句型转换。
1. They have got some apples. (改为一般疑问句并作肯定回答)
_____ they got _____ apples?
Yes, _____ _____ .
2. There is some juice in the bottle. (改为否定句)
There _____ _____ juice in the bottle.
3. I have got an orange. (改为复数形式)
_____ _____ got _____ _____ _ .
4. Tom's favourite drink is Coke. (对划线部分提问)
_____ _____ Tom's favourite drink?
5. has, any, fish, Green, got, Mr. , not (. )(连词成句)
_______________________.