求方程3x+5y=31的整数解
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解决时间 2021-02-11 23:50
- 提问者网友:夢醒日落
- 2021-02-11 17:07
求方程3x+5y=31的整数解
最佳答案
- 五星知识达人网友:零点过十分
- 2021-02-11 17:13
3x + 5y = 31,
6 + 25 = 31,
3x = 6,
x1 = 2,
5y = 25,
y1 = 5,
还有
21 + 10 = 31,
3x = 21,
x2 = 7,
5y = 10,
y2 = 2,
还有
-9 + 40 = 31,
3x = -9,
x3 = -3,
5y = 40,
y = 8,
还有
-24 + 55 = 31,
3x = -24,
x4 = -8,
5y = 55,
y4 = 11,
解方程得,
x1 = 2,y1 = 5,
x2 = 7,y2 = 2,
x3 = -3,y3 = 8,
x4 = -8,y4 = 11,
正整数的解只有两对,
负整数的解就有无限更多,
6 + 25 = 31,
3x = 6,
x1 = 2,
5y = 25,
y1 = 5,
还有
21 + 10 = 31,
3x = 21,
x2 = 7,
5y = 10,
y2 = 2,
还有
-9 + 40 = 31,
3x = -9,
x3 = -3,
5y = 40,
y = 8,
还有
-24 + 55 = 31,
3x = -24,
x4 = -8,
5y = 55,
y4 = 11,
解方程得,
x1 = 2,y1 = 5,
x2 = 7,y2 = 2,
x3 = -3,y3 = 8,
x4 = -8,y4 = 11,
正整数的解只有两对,
负整数的解就有无限更多,
全部回答
- 1楼网友:野味小生
- 2021-02-11 18:58
X=7,Y=2追问详细的过程
- 2楼网友:山君与见山
- 2021-02-11 17:56
方程3x+5y=31的整数解有:
x=2,y=5;
x=7,y=2;
x=12,y=-1;
x=17,y=-4.
……
x增减5或5的倍数,y减增3或3的倍数。
x=2,y=5;
x=7,y=2;
x=12,y=-1;
x=17,y=-4.
……
x增减5或5的倍数,y减增3或3的倍数。
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