因式分（a2+b2）2-4a2b2=______．_爱下问搜题

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问题填空题

因式分（a²+b²）²-4a²b²=______．

答案

（a²+b²）²-4a²b²=（a²+b²+2ab）（a²+b²-2ab）=（a+b）²（a-b）²；

故答案为（a+b）²（a-b）²

完形填空

选择补全对话。

A: Look! 1_______ the boy?
A: 3_______ is he doing?
A: Does he 4_______ that jacket?
A: 5_______ 6_______ pairs of socks
7_______ he have?
A: Does he need 8_______ shirts 9_______?

B: 2_______ is Li Ming.
B: He is packing his suit case.
B: No, he doesn't.
B: He has one pair of socks.

B: Yes, he 10_______.

( ) 1. A. who's
( ) 2. A. He
( ) 3. A. Where
( ) 4. A. want
( ) 5. A. How
( ) 6. A. many
( ) 7. A. do
( ) 8. A. a
( ) 9. A. two
( ) 10. A. do

B. whose
B. He's
B. What
B. wants
B. What
B. much
B. is
B. much
B. to
B. does

C. whose's
C. His
C. How
C. wanting
C. Where
C. old
C. can
C. an
C. too
C. is

D. what's
D. He
D. When
D. to want
D. Who
D. tall
D. does
D. more
D. either
D. can

选择题

如果a是方程x²-3x+m=0的一个根，-a是方程x²+3x-m=0的一个根，那么a的值等于[ ]

A.1或2

B.0或-3

C.-1或-2

D.0或3