(A) A>B (B) A<B
(C)A=B (D)无法确定、
三、计算:(4分×6=24分) (1)(-2ab2)2·(3a2b-2ab-1) (3)(x-
(2)4(a-b)2-(2a+b)(-b+2a)
121
)(+x)2 22
(4)(x+3y)(x2+9y2)(x-3y)
(5)(1+x-y)(x+y-1) (6) 9992-1002×998
四、把下列各式分解因式:(4分×8=32分)
(1)(2a+b2)-4a2 (2)4m(m-n)+4n(n-m)
(3)16x2-64 (4)-4a2+24a-36
(5)x4-2x2+1 (6)(a2+4)2-16a2