2021-2022年英语周报八年级外研第14期答案

读后縷写【参考范文】We made up our minds to save the nurse with him together.We were faced with falling rubble from time to time. The trappednurse was still alive. We focused our efforts on removing thebricks and the rubble that trapped her body. Once she was freethe doctor guided us through the remains safely. He kept a perfectly caim tone throughout, which smoothed me much. My hearleaped with joy as we successfully walked out of the building. Althe survivors' gratitude was profound and boundless.Later in the afternoon I had time to Look around, and satthe destroyeed building. My beautifui workplace now lay beyonrecognition. The only thing that remained was broken wallsmidst the dim dust. I felt a weignt on my chest as the sednswelled inside. The doctor stood beside me and said with a fsmile,"We should be happy for those who survived the eartquake."I smiled back as the wind danced around us, and Ilucky to be alive.

解:(1)由题知√(x)=lnx - 1-af(1)=0,函数∫(x)在点(1、(1)的切线斜率为f(1)=2-a=3,解得a=-1,(1,0)在3x-y b=0上3-0 b=0,解得b=-3∴实数a,b的值分别为-1,-3.(4分)(2)当xe(0,1)时,(x)<0即加x-(1)<0对xe(0,1)成立令h(x)=加nx-(x-1),则M(x)=1--20=2 2(1-9x 1,A(1)=0.x(x 1)2①当a≤2,x(0,1)时,x2 2(1-a)x 1≥x2-2x 1>0,h'(x)>0(x)在x∈(0,1)上单调递增h(x) 2时,令h(x)=0得x1=a-1-√(a-1)2-1,x2=a-1 √(a-1)2-1.由x2>1与x12=1得,0 h(1)=0,不符合题意综上所述,实数a的取值范围是(-∞,2].(12分)

以上就是2021-2022年英语周报八年级外研第14期答案，更多英语周报答案请关注本网站。