2023考研数学一真题及答案.pdf完整版百度云下载

11.当x0时，2f(x)axbxln(1x)与2()ecosxgxx是等价无穷小，则ab________.

【答案】2

12.曲面22zx2yln(1xy)在(0.0)处的切平面方程为________.【答案】x2yz0

8

13.设f(x)是周期为2的周期函数，且f(x)1x,x[0.1]，01()cos,2nnafxanx则21nna________.【答案】0

14.设连续函数f(x)满足f(x2)f(x)x，20f(x)dx0，则31f(x)dx_________.【答案】12

15.已知向量12311223311010111.,,,10111111kkk，若(1.2.3)TTiii，则222123kkk________.【答案】119