90 100
2 20
1 ( )
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2. ( )
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3. ( )
A. B.
C. D.
4 22 9x mx m ( )
A3 B3 C6 D6
5 P
34 P x ( )
A 34B 4 3C 3 4D4 3
6 50 ( )
A50B50 65C80D65
7 2
1 1
(1 )
1
a
a a =( )
AaB1
1a C1
1a D1
a
8 ( )
1-y-xyx1-y-x 22 1xxxx 23
22
2yxy2-xy-x y3-x3xy9-x 22 y
A. 1 B. 2 C. 3 D. 4 .
9 5400
