在平面直角坐标系中，点P（-3，-1）到原点的距离是_1。_刷题宝

题干

在平面直角坐标系中，点P（-3，-1）到原点的距离是____ 。

上一题下一题 0.0难度选择题更新时间:2018-07-04 07:18:17

答案(点此获取答案解析）

2

同类题1

在物理课上，同学们通过实验对斜面的机械效率进行探究。其中一组同学研究“斜面的倾斜程度跟机械效率的关系”。下表是他们的部分实验数据。

同类题2

用简便方法计算

7.58×0.4×0.25

=7.58×____

=____

同类题3

我们规定：若 $\vec{m}$ =（a，b）， $\vec{n}$ =（c，d），则 $\vec{m} \cdot \vec{n}$ =ac+bd．如 $\vec{m}$ =（1，2）， $\vec{n}$ =（3，5），则 $\vec{m} \cdot \vec{n}$ =1×3+2×5=13．

同类题4

画一画、算一算

例， ____

同类题5

阅读理解
Mary, Tom, Alan did different things in the past summer vacation. Here are what they had done:

	Mary	Tom	Alan
Where	China	Spain	Canada
When to leave	The first week in June	The last day of May	July 18^th, Monday
With	His parents	His best friends	His cousin
What	Went hiking. Visited some interesting places in Beijing. Went shopping.	Went shopping . Went camping. Watched bullfight（斗牛）	Spent time on the farm. Went fishing. Slept a lot.
How long	About one month.	Only two weeks	Fifty days
By	Plane and bus	Boat and plane	Plane and train

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