2022英语周报卷一16期答案

21.解:(1)由题意可知,命题p为真命题由集合M={xkx2-2kx+1=0,∈R}为空集,得方程kx2-2kx*-1=0没有实数解,所以当k=0时,方程变为1=0,故无解,符合题意当k≠0时,Δ-4k2-4k<0,即0 0的解集为R得Δ=(k…1)2-16<0,解得一3

36 have puzzled/ have been puzzling 37. which 38. height40. weighing41. known42. currently43. the44. locationsn? 45. were transported

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