The table shows the number of school days each month during the last school year.[img=401x44]1803d982913de59.png[/img]Which of the graphs best represents the data?[img=351x231]1803d9829d3bc4c.png[/img][img=221x166]1803d982a7e0ae6.png[/img][img=162x210]1803d982b6373f5.png[/img][img=211x209]1803d982c4df3b0.png[/img]
A: Graph 1.
B: Graph 2.
C: Graph 3.
D: Graph 4.
A: Graph 1.
B: Graph 2.
C: Graph 3.
D: Graph 4.
举一反三
- The table shows the number of school days each month during the last school year.[img=401x44]1803d982a807fe5.png[/img] A: Graph 1. B: Graph 2. C: Graph 3. D: Graph 4.
- 设随机变量(X,Y)在区域｛(x,y): 0<|y|< x <2｝内均匀分布，则以下结果正确的是 A: 当0<x<2时，[img=96x25]1802dded7db6eef.png[/img]. B: E(X)=4/3 C: 当0<|y|<2时,[img=105x45]1802dded872b92f.png[/img]. D: P(X<1)=0.5 E: 当0<x<2时,[img=110x45]1802dded915de6e.png[/img]. F: E(X)=2/3 G: 当0<y<2时，[img=95x43]1802dded9a54300.png[/img].
- 设[img=127x53]17f1b3d6db98b83.jpg[/img]，f（x）=arctanΧ，则[img=56x55]17f1b3d82842941.jpg[/img]=（）。 A: π B: 3π/4 C: -3π/4 D: 2π
- 设三阶方阵[img=117x75]17da6265af67565.png[/img]有特征值[img=36x21]17da6265c0f8ef3.png[/img],则[img=26x15]17da6265d451088.png[/img] ,[img=27x17]17da5b7f743dcc3.png[/img] . A: x=1, y=1 B: x=2, y=1 C: x=3, y=0 D: x=0, y=3
- 下列關於函數[img=9x23]17de5fbd984e1e1.png[/img]何者正確? 如果[img=170x27]17de67a4253f96d.png[/img], [img=87x21]17de67a43152acf.png[/img].0≤x≤2π0≤x≤2π A: Inflection point (π/3 , 5/4) B: - C: - D: -