将曲线 {}2x^2+y^2=1,z=0. 绕 y 轴旋转一周所生成的旋转曲面的方程为（）A. 2x^2 + y^2 + z^2 = 1B. 2(x^2 + z^2)+ y^2 = 1C. 2x^2 + y^2 - z^2 = 1D. 2(x^2 - z^2)+ y^2 = 1

求下列极限:lim _(xarrow 0)[ dfrac (1)(ln (1+x))-dfrac (1)(x)]

四、(10分)计算行列式 _(n)=-|||- a+b b a . a+b b a . a+b b a a+b a . (aneq b)-|||-b-|||-a+b

若z0是f(z)的一阶极点,则() ()-|||-A. [ f(z),(z)_(0)] =lim _(zarrow {x)_(0)}(z-(z)_(0))f(z)-|||-B. [ f(z),(z)_(0)] =lim _(zarrow 20)((z-{z)_(0))}^2f(z)-|||-C. [ f(z),(z)_(0)] =lim _(zarrow {z)_(0)}(z)_(0)f(z)-|||-D. in (f(z),(z)_(0)] =lim _(zarrow {x)_(0)}[ (z-(z)_(0))f(z)] '

2.已知8个晶体管中有2个次品,现从中任取2个晶体管,则2个中恰有1个次品的概率-|||-为 __ -

5.设alpha=(}a_(1)a_(2)a_(3)=0(i=1,2,3)交于一点的充要条件为（）A. α,β,γ线性相关;B. α,β,γ线性无关;C. R(α,β,γ)=R(α,β);D. α,β,γ线性相关，而α,β线性无关;

计算(t)=3+2(e)^-it的傅里叶变换( )(t)=3+2(e)^-it(t)=3+2(e)^-it(t)=3+2(e)^-it

int (arcsin x)^2dx

假设x=1.24是由精确值x*经过四舍五入得到的近似值。则x的绝对误差限为()。A. 0.05B. 10.001C. 0.005D. 0.01

7.一寻呼台每分钟收到寻呼的次数服从参数为4的泊松分布,则每分钟恰有7次寻呼的概-|||-率为 ()-|||-(A) dfrac ({4)^7}(7)(e)^-4 (B) dfrac ({4)^6}(6!)(e)^-4 (C) dfrac ({4)^7}(7!)(e)^-4-dfrac ({4)^6}(6!)(e)^-4 (D) https:/img.zuoyebang.cc/zyb_a1cc81cc64d7dc57ede452da318872ef.jpg-dfrac ({4)^6}(6)(e)^-4-|||-A 1-|||-B 2-|||-C 3-|||-D 4

热门问题