1-5 BADDC 6-10 DCBCB 11-12 DA 13. 9/4 14. 8 15. -2 16.(√5-1)/2 17. 11 61 甲有显著提高 18.(1)(√21)/14 (2)(√3)/10 19.(3) (√2)/2 20.(2) (0,3) 21.(1) (ln2)x+y-ln2=0 (2)a=1/2 b=-1/2 (3)(0,1/2) 22.(1)x²+(y-1)²=1.x∈[0,1],y∈[1,2] (2)(-∞,0)∪(2√2,+∞) 23.(1)[-2,2] (2)8。
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