例4.求int(dx)/(1+e^x).

1.简便计算下面各题。-|||-(1) (3) (1212-12.12)div (4848-48.48)-|||-(4) .725div 2.5div 32div 0.125-|||-(5) .87div 28.6times 4.59div 98.7times 2.86div 45.9-|||-(6) (6.4times 12.5times 0.5)div (2.5times 1.6times 0.2-|||-(7) .24times 0.1+0.5times 72.4+0.049-|||-times 724.98times 1.5-|||-(2) .7div 0.8-17.7div 0.81.简便计算下面各题。-|||-(1) (3) (1212-12.12)div (4848-48.48)-|||-(4) .725div 2.5div 32div 0.125-|||-(5) .87div 28.6times 4.59div 98.7times 2.86div 45.9-|||-(6) (6.4times 12.5times 0.5)div (2.5times 1.6times 0.2-|||-(7) .24times 0.1+0.5times 72.4+0.049-|||-times 724.98times 1.5-|||-(2) .7div 0.8-17.7div 0.81.简便计算下面各题。-|||-(1) (3) (1212-12.12)div (4848-48.48)-|||-(4) .725div 2.5div 32div 0.125-|||-(5) .87div 28.6times 4.59div 98.7times 2.86div 45.9-|||-(6) (6.4times 12.5times 0.5)div (2.5times 1.6times 0.2-|||-(7) .24times 0.1+0.5times 72.4+0.049-|||-times 724.98times 1.5-|||-(2) .7div 0.8-17.7div 0.8

判断 approx 26 ()

设二阶线性非齐次方程 y'' + p(x)y' + q(x)y = f(x) 有三个特解 y_1 = x，y_2 = e^x，y_3 = e^2x，则其通解为()。A. x + C_1e^x + C_2e^2xB. C_1x + C_2e^x + C_3e^2xC. x + C_1(e^x - e^2x)+ C_2(x - e^x)D. C_1(e^x - e^2x)+ C_2(e^2x - x)

等边三角形一定是锐角三角形。() ()-|||-正确-|||-错误-|||-

3.（单选题，3.0分）设函数f(x)=(1)/(x)，g(x)=1-x，则f[g(x)]=A. 1-(1)/(x)B. 1+(1)/(x)C. (1)/(1-x)D. x

单选题（共20题，100.0分） 9. (5.0分) A满足关系式A^2-2A+E=0，则A的一个特征值是（）A. lambda=1;B. lambda=-1;C. lambda=2;D. lambda=-2.

1.设f(x)为可导函数,且 lim _(xarrow 0)dfrac (f(1)-f(1-x))(2x)=-1 ,则 f'(1)= __

1.用点向式方程及参数方程表示直线 =dfrac {y)(2)=dfrac (z-1)(5) 的直线方程.-|||-4.求过点 (2,-3,1) 且垂直于平面 2x+3y+z+1=0 的直线方程.-|||-5.求过点(0,1,2 )且与直线 dfrac (x-1)(1)=dfrac (y-1)(-1)=dfrac (z)(2) 垂直相交的直线方程.-|||-6.求点 (-1,2,0) 在平面 x+2y-z+1=0 上的投影点.-|||-7.求点(2,3,1)在直线 dfrac (x+7)(1)=dfrac (y+2)(2)=dfrac (z+2)(3) 上的投影点.-|||-8.求直线 =dfrac {y)(-1)=dfrac (z+1)(2) 与平面 x-y+2z=3 之间的夹角.

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