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【简答题】
（1） A与2x 2 y-5xy 2 +6y 3 的和为3x 2 -4x 2 y+5y 2 ，求A． （2）已知：（2a+2b+1）（2a+2b-1）=63，求a+b的值． （3）若2x+y=3，求4 x ?2 y 的值．
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【单选题】I. Gram negative bacteria II. Chemoorganotrophic heterotrop
A.
All members of I are also members of II, but not all members of II are members of I.
B.
All members of II are also members of I, but not all members of I are members of II.
C.
All members of I are members of II, and all members of II are members of I.
D.
No member of I is also a member of II.
E.
Some members of I are members of II and some are not, and some members of II are members of I and some are not.
【单选题】I. Photoorganotrophic heterotroph II. Chemolithotrophic autotroph
A.
All members of I are also members of II, but not all members of II are members of I.
B.
All members of II are also members of I, but not all members of I are members of II.
C.
All members of I are members of II, and all members of II are members of I.
D.
No member of I is also a member of II.
E.
Some members of I are members of II and some are not, and some members of II are members of I and some are not.
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