九江学院专升本高数真题-
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1.已知f(x1x23x,则f(sinx______. 1xsin,x02.已知f(x在R上连续,则a_____. xax2,x03.极限lim(x1x2x_________. x4.已知yln(x1x2,则y'_____. xy5.已知函数ze,则此函数在(2,1)处的全微分dz_____________. 1.设f(x二阶可导,a为曲线yf(x拐点的横坐标,且f(x在a处的二阶导数等于零,则在a的两侧( )
A.二阶导数同号 B.一阶导数同号 C.二阶导数异号 D.一阶导数异号 2.下列无穷级数绝对收敛的是( )
A.(1n1n11n11n11n1 B.(1 C.(1 D.(1n nn2nn1n1n13.变换二次积分的顺序dy022yy2f(x,ydx( )
4xA.dx02xx2f(x,ydy B.dxxf(x,ydy
02 C.dx042xx2f(x,ydy D.dx04x2xf(x,ydy
4.已知f(x(etdt2x20x0edt2t2,则limf(x( )
xA.1 B.-1 C.0 D.+
5.曲面