A . 正确
B . 错误
. . .-|||-.-dfrac (2)(3)pi +2kpi ,k=0.pm 1 . . . .-|||-(C) dfrac (1)(3)pi +2kpi
[1.21]已知封闭的圆环中粒子的能级为-|||-E =dfrac ({n)^2(h)^2}(8{pi )^2m(R)^2} .n=0 ,pm 1 ,pm 2
[单选题]当t=0°时，i1、i2、i3分别为（）。A .0、负值、正值B .0、正值、负值C .负值、0、正值D .负值、正值、0
矩阵0 1 0-|||-1 2 3-|||-2 3 4，则0 1 0-|||-1 2 3-|||-2 3 4。0 1 0-|||-1 2 3-|||-2 3 4
A . 0 B . =-dfrac (1-5i)(2+3i) C . =-dfrac (1-5i)(2+3i)D . =-dfrac (1-5i)(2+3i)设
0 2 4 0-|||-2 0 0 -3-|||--1 2 1 0-|||-0 3 0 1且第三行元素的代数余子式为0 2 4 0-|||-2 0 0 -3-|
下列矩阵为正定矩阵的是（）1 2 0 0-|||-2-|||-2 3 0 0-|||-3-|||-0 0 21 2 0 0-|||-2-|||-2 3 0 0-
(2024·新课标I卷)已知A(0,-|||-3)和 (3,dfrac (3)(2)) 为椭圆 :dfrac ({x)^2}({a)^2}+dfrac ({y)
_(0)=2;-|||-(3) dfrac (1)({2)^2} , _(0)=-1;-|||-(4) dfrac (1)(4-3z), _(0)=1+i;-|
5 9-|||-1 2 3 1 3-|||-(3) 3 2 -4 = 0 -2-|||-2 -1 0 2 1