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()3.23()


3.2 3 ¦ A 1(x1) x20 ( A{x|x>1} C{x|x1 x2} (x1) x20 ? ?x10 ? x2 ?x20 ? ) B{x|x1} D{x|x2 x1} ?x1 x2 C. C 2 A{x|ax2ax1<0}? a ( ) A{a|0<a<4} C{a|0<a4} B{a|0a<4} D{a|0a4} ax2ax1<0 a0 ? ?a>0 ? ?a>0 a0 ? ?? 2 ?0a4. ? ? 0 ? ?a 4a0 0a4. D. D 3 M?x? ? ?x3 <0?N{x|x3}{x|x1} ? ?x1 ? ? ( ) BMN D?R(MN) AMN C?R(MN) M{x|3<x<1}N{x|x3} MN{x|x<1}?R(MN){x|x1} D. D ? ? 1? 4 f(x)0 ?x?x1x2? ? ? ? f(10x)0 ( ) A{x|x1 xlg 2} B{x|1xlg 2} C{x|xlg 2} D{x|xlg 2} ? ? ? ? ? 1? f(x)0 ?x?1x2?. 1 1 f(10x)0110x xlg xlg 2. 2 2 D 5 a[11] f(x)x2(a4)x42a x ( A1<x<3 C1<x<2 ) Bx<1 x>3 Dx<1 x>2 f(x)x2(a4)x42a>0 a[1 1]?(x2)a x24x4>0a[11] ?x21x24x4>0 ? ? 2 ? ?x21x 4x4>0 3<x x<1. B. B 6(a21)x2(a1)x1<0 R a ________ ? 3 ? ?51? ? ? 7 x ax1 <0 ( x1 ? 1 ? 1)?2? a________ ? ? ax1 ? 1 ? <0 (1)?2? ? ? x1 1 ax10 a2. 2 2 x2 8 x xm10 m m ________ x2 xm10

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