x^2+y^2<=100的整数解共有多少对? 求计算方法
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解决时间 2021-12-02 15:13
- 提问者网友:斑駁影
- 2021-12-02 03:10
x^2+y^2<=100的整数解共有多少对? 求计算方法
最佳答案
- 五星知识达人网友:玩世
- 2021-12-02 03:39
x=0,±1,±2,±3,±4,±5,±6,±7,±8,±9,±10
y=±10,±9,±8,±7,±6,±5,±4,±3,±2,±1,0
圆心在原点半径为10的圆内[包括圆周上]所有整数坐标点均满足不等式。
79×4-10×2+10×4-1=335
k=m×4-n×2+n×4-1
=4m+2n-1
本题n=11-1=10 (0-10共11个数),m=79(x或y的非0取值个数)
y=±10,±9,±8,±7,±6,±5,±4,±3,±2,±1,0
圆心在原点半径为10的圆内[包括圆周上]所有整数坐标点均满足不等式。
79×4-10×2+10×4-1=335
k=m×4-n×2+n×4-1
=4m+2n-1
本题n=11-1=10 (0-10共11个数),m=79(x或y的非0取值个数)
全部回答
- 1楼网友:几近狂妄
- 2021-12-02 08:03
不对吧,何止40个,光看看下面这个就已经90对了,还要考虑正负搭配呢。
x=0时,y=0,1,2,3,4,5,6,7,8,9,10;
x=1时,y=0,1,2,3,4,5,6,7,8,9;
x=2时,y=0,1,2,3,4,5,6,7,8,9;
x=3时,y=0,1,2,3,4,5,6,7,8,9;
x=4时,y=0,1,2,3,4,5,6,7,8,9;
x=5时,y=0,1,2,3,4,5,6,7,8;
x=6时,y=0,1,2,3,4,5,6,7,8;
x=7时,y=0,1,2,3,4,5,6,7;
x=8时,y=0,1,2,3,4,5,6;
x=9时,y=0,1,2,3,4;
x=10时,y=0;
x=0时,y=0,1,2,3,4,5,6,7,8,9,10;
x=1时,y=0,1,2,3,4,5,6,7,8,9;
x=2时,y=0,1,2,3,4,5,6,7,8,9;
x=3时,y=0,1,2,3,4,5,6,7,8,9;
x=4时,y=0,1,2,3,4,5,6,7,8,9;
x=5时,y=0,1,2,3,4,5,6,7,8;
x=6时,y=0,1,2,3,4,5,6,7,8;
x=7时,y=0,1,2,3,4,5,6,7;
x=8时,y=0,1,2,3,4,5,6;
x=9时,y=0,1,2,3,4;
x=10时,y=0;
- 2楼网友:污到你湿
- 2021-12-02 07:46
写过过程太麻烦了
共有40组解
从-10到10共有21组数字,当取得-10、10时只能有一组解,其它数字都能取得2组解
故而解的个数为21×2-2=40
共有40组解
从-10到10共有21组数字,当取得-10、10时只能有一组解,其它数字都能取得2组解
故而解的个数为21×2-2=40
- 3楼网友:一袍清酒付
- 2021-12-02 07:38
用c语言写个程序就OK了!
参考资料:如果您的回答是从其他地方引用,请表明出处
- 4楼网友:独行浪子会拥风
- 2021-12-02 06:40
你就一直往下排就行,我以前就是这么做的,而且是对的,例如:
x=0时,y=0,1,2,3,4,5,6,7,8,9,10;
x=1时,y=0,1,2,3,4,5,6,7,8,9;
x=2时,y=0,1,2,3,4,5,6,7,8,9;
x=3时,y=0,1,2,3,4,5,6,7,8,9;
x=4时,y=0,1,2,3,4,5,6,7,8,9;
x=5时,y=0,1,2,3,4,5,6,7,8;
x=6时,y=0,1,2,3,4,5,6,7,8;
x=7时,y=0,1,2,3,4,5,6,7;
x=8时,y=0,1,2,3,4,5,6;
x=9时,y=0,1,2,3,4;
x=10时,y=0;
你数数就可以了,不知道你要的是不是只有正整数解,如果包括负整数,你也可以这么解-----------这是枚举法
你也可以画图,画出x^2+y^2=100的二次曲线图,看看它包含着多少整数解就行了,作图在这不太好说明白。
x=0时,y=0,1,2,3,4,5,6,7,8,9,10;
x=1时,y=0,1,2,3,4,5,6,7,8,9;
x=2时,y=0,1,2,3,4,5,6,7,8,9;
x=3时,y=0,1,2,3,4,5,6,7,8,9;
x=4时,y=0,1,2,3,4,5,6,7,8,9;
x=5时,y=0,1,2,3,4,5,6,7,8;
x=6时,y=0,1,2,3,4,5,6,7,8;
x=7时,y=0,1,2,3,4,5,6,7;
x=8时,y=0,1,2,3,4,5,6;
x=9时,y=0,1,2,3,4;
x=10时,y=0;
你数数就可以了,不知道你要的是不是只有正整数解,如果包括负整数,你也可以这么解-----------这是枚举法
你也可以画图,画出x^2+y^2=100的二次曲线图,看看它包含着多少整数解就行了,作图在这不太好说明白。
- 5楼网友:零点过十分
- 2021-12-02 05:14
x^2+y^2<=100的整数解共有多少对? 求计算方法
因为0<=x^2,0<=y^2,所以x^2<=100,y^2<=100
0<=| x |<=10,0<=| y |<=10,
利用列举法(列举法是一种借助对一具体事物的特定对象(如特点、优缺点等)从逻辑上进行分析并将其本质内容全面地一一地罗列出来的手段,再针对列出的项目一一提出改进的方法。)
| x |=0,| y |<=10,X=0,Y=0,1,2,3,4,5,6,7,8,9,10,-1,-,2,-3,-4,-5,-6,-7,-8,-9,-10,21组
| x |=1,| y |<=根号99,X=1,Y=0,1,2,3,4,5,6,7,8,9,-1,-,2,-3,-4,-5,-6,-7,-8,-9,;X=-1,Y=0,1,2,3,4,5,6,7,8,9,-1,-,2,-3,-4,-5,-6,-7,-8,-9;38组
| x |=2,| y |<=根号96,X=2,Y=0,1,2,3,4,5,6,7,8,9,-1,-,2,-3,-4,-5,-6,-7,-8,-9,;X=-2,Y=0,1,2,3,4,5,6,7,8,9,-1,-,2,-3,-4,-5,-6,-7,-8,-9;38组;
| x |=3,| y |<=根号91,X=3,Y=0,1,2,3,4,5,6,7,8,9,-1,-,2,-3,-4,-5,-6,-7,-8,-9,;X=-3,Y=0,1,2,3,4,5,6,7,8,9,-1,-,2,-3,-4,-5,-6,-7,-8,-9;38组;
| x |=4,| y |<=根号84,X=4,Y=0,1,2,3,4,5,6,7,8,9,-1,-,2,-3,-4,-5,-6,-7,-8,-9;X=-4,Y=0,1,2,3,4,5,6,7,8,9,-1,-,2,-3,-4,-5,-6,-7,-8,-9;38组;
| x |=5,| y |<=根号75,X=5,Y=0,1,2,3,4,5,6,7,8,-1,-,2,-3,-4,-5,-6,-7,-8;X=-5,Y=0,1,2,3,4,5,6,7,8,-1,-,2,-3,-4,-5,-6,-7,-8;34组;
| x |=6,| y |<=8,X=6,Y=0,1,2,3,4,5,6,7,8,-1,-,2,-3,-4,-5,-6,-7,-8,;X=--6,Y=0,1,2,3,4,5,6,7,8,-1,-,2,-3,-4,-5,-6,-7,-8;34组;
| x |=7,| y |<=根号51,X=7,Y=0,1,2,3,4,5,6,7,-1,-,2,-3,-4,-5,-6,-7;X=-7,Y=0,1,2,3,4,5,6,7,-1,-,2,-3,-4,-5,-6,-7;30组
| x |=8,| y |<=6,X=8,Y=0,1,2,3,4,5,6,-1,-,2,-3,-4,-5,-6;X=-8,Y=0,1,2,3,4,5,6,-1,-,2,-3,-4,-5,-6;26组
| x |=9,| y |<=根号19,X=8,Y=0,1,2,3,4,-1,-,2,-3,-4;X=-8,Y=0,1,2,3,4,-1,-,2,-3,-4;18组
| x |=10,| y |<=0,x=10,y=0;x=-10,y=0;2组
一共21+38+38+38+38+34+30+26+18+2=283组
因为0<=x^2,0<=y^2,所以x^2<=100,y^2<=100
0<=| x |<=10,0<=| y |<=10,
利用列举法(列举法是一种借助对一具体事物的特定对象(如特点、优缺点等)从逻辑上进行分析并将其本质内容全面地一一地罗列出来的手段,再针对列出的项目一一提出改进的方法。)
| x |=0,| y |<=10,X=0,Y=0,1,2,3,4,5,6,7,8,9,10,-1,-,2,-3,-4,-5,-6,-7,-8,-9,-10,21组
| x |=1,| y |<=根号99,X=1,Y=0,1,2,3,4,5,6,7,8,9,-1,-,2,-3,-4,-5,-6,-7,-8,-9,;X=-1,Y=0,1,2,3,4,5,6,7,8,9,-1,-,2,-3,-4,-5,-6,-7,-8,-9;38组
| x |=2,| y |<=根号96,X=2,Y=0,1,2,3,4,5,6,7,8,9,-1,-,2,-3,-4,-5,-6,-7,-8,-9,;X=-2,Y=0,1,2,3,4,5,6,7,8,9,-1,-,2,-3,-4,-5,-6,-7,-8,-9;38组;
| x |=3,| y |<=根号91,X=3,Y=0,1,2,3,4,5,6,7,8,9,-1,-,2,-3,-4,-5,-6,-7,-8,-9,;X=-3,Y=0,1,2,3,4,5,6,7,8,9,-1,-,2,-3,-4,-5,-6,-7,-8,-9;38组;
| x |=4,| y |<=根号84,X=4,Y=0,1,2,3,4,5,6,7,8,9,-1,-,2,-3,-4,-5,-6,-7,-8,-9;X=-4,Y=0,1,2,3,4,5,6,7,8,9,-1,-,2,-3,-4,-5,-6,-7,-8,-9;38组;
| x |=5,| y |<=根号75,X=5,Y=0,1,2,3,4,5,6,7,8,-1,-,2,-3,-4,-5,-6,-7,-8;X=-5,Y=0,1,2,3,4,5,6,7,8,-1,-,2,-3,-4,-5,-6,-7,-8;34组;
| x |=6,| y |<=8,X=6,Y=0,1,2,3,4,5,6,7,8,-1,-,2,-3,-4,-5,-6,-7,-8,;X=--6,Y=0,1,2,3,4,5,6,7,8,-1,-,2,-3,-4,-5,-6,-7,-8;34组;
| x |=7,| y |<=根号51,X=7,Y=0,1,2,3,4,5,6,7,-1,-,2,-3,-4,-5,-6,-7;X=-7,Y=0,1,2,3,4,5,6,7,-1,-,2,-3,-4,-5,-6,-7;30组
| x |=8,| y |<=6,X=8,Y=0,1,2,3,4,5,6,-1,-,2,-3,-4,-5,-6;X=-8,Y=0,1,2,3,4,5,6,-1,-,2,-3,-4,-5,-6;26组
| x |=9,| y |<=根号19,X=8,Y=0,1,2,3,4,-1,-,2,-3,-4;X=-8,Y=0,1,2,3,4,-1,-,2,-3,-4;18组
| x |=10,| y |<=0,x=10,y=0;x=-10,y=0;2组
一共21+38+38+38+38+34+30+26+18+2=283组
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