过点(1,2,1),且垂直与向量(3,4,5)的平面的一般方程为:
A: 3(x-1) + 4(y-2) + 5(z-1)=0
B: 3x + 4y + 5z -16 = 0
C: 3(x-2) + 4(y-1) + 5(z-1) = 0
D: 3x + 4y + 5z = 0
A: 3(x-1) + 4(y-2) + 5(z-1)=0
B: 3x + 4y + 5z -16 = 0
C: 3(x-2) + 4(y-1) + 5(z-1) = 0
D: 3x + 4y + 5z = 0
B
举一反三
- 执行以下语句的结果:dict1={"x":1,"y":2,"z":3}dict2={"x":4,"a":5}dict1.update(dict2) A: {"x":1,"y":2,"z":3,"x":4,"a":5} B: {"x":4,"a":5,"x":1,"y":2,"z":3} C: 有重复项,结果有误! D: {"x":4,"y":2,"z":3,"a":5}
- int x=3,y,z;<br/>y=-x++;<br/>z=y+8/++x;<br/>Console.WriteLine{{0},{1},{2}",x,y,z);<br/>此程序的输出结果是____。 A: 5,-3,-2 B: 4,-3,-1 C: 4,-4,-2 D: 5,-4,-2
- 已知直线的一般方程\( \left\{ {\matrix{ {x - 2y - z + 4 = 0} \cr {5x + y - 2z + 8 = 0} \cr } } \right. \), 则其点向式方程为( ) A: \( { { x - 2} \over 2} = {y \over { - 3}} = { { z - 4} \over {11}} \) B: \( {x \over 5} = {y \over { - 3}} = { { z - 4} \over {11}} \) C: \( { { x - 2} \over 5} = { { y + 1} \over { - 3}} = { { z - 4} \over {11}} \) D: \( { { x - 2} \over 2} = { { y + 1} \over { - 3}} = { { z - 4} \over {11}} \)
- intx=5,y=8,z=7;表达式z=!(x>y)||(x=1,y=3)计算后的结果 A: x=1,y=3,z=1 B: x=1,y=3,z=0 C: x=5,y=8,z=0 D: x=5,y=8,z=1
- 若x=[1 2 3 4 5];y=[2 -1 4 3 -2];则z=x.*y=()
内容
- 0
Defined: int x=3, y=4, z=5; The value of the expression!(x+y) +z-1 && y+z/2 is(). A: 6 B: 0 C: 2 D: 1
- 1
下列哪条语句是正确的( ) A: A=[1 2;3 4];B=[3;7];A.*B; B: A=cell(2,3);A(1,2)=[4;5]; C: A=[2 3 5 7;9 4 6 1;7 3 2 5];B=[1 7;0 5];A(2:end,2:2:end) D: x=-5:5;y=-5:5;z=x.*x-y.*y;surf(x,y,z);
- 2
设x=3,y=4,z=5,则表达式((x+y)>z)&&(y==z)&&x||y+z&&y+z的值为_________。 A: 0 B: 1 C: 2 D: 3
- 3
过点(2,-3,-4)且与平面3 x + y - z +1=0 垂直的直线方程是( )
- 4
设x,y,z为int型变量,且x=3,y=-4,z=5,则表达式 !(x>y)+(y!=z)||(x+y)&&(y-z)的值为( ) A: -1 B: 0 C: 1 D: 2