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问题
选择题
如果x
1
,x
2
是两个不相等的实数,且满足x
1
2
+3x
1
-1=1, x
2
2
+3x
2
-1=1,那么x
1
·x
2
等于( )
A.2
B.-2
C.3
D.-3
答案
答案:
B
选择题
选出每组中不同类的单词。
( ) 1. A. food
( ) 2. A. teacher
( ) 3. A. pen
( ) 4. A. wind
( ) 5. A. five
B. breakfast
B. doctor
B. pencil
B. snow
B. fifty
C. lunch
C. student
C. apple
C. cloud
C. fifth
D. supper
D. school
D. eraser
D. weather
D. fifteen
查看答案
选择题
I have a wonderful friend _______Kitty.
A.name
B.names
C.naming
D.named
查看答案