在线解一元方程：
直接输入任意的一元方程，然后点击“下一步”按钮，即可获得方程的解。
它支持包含数学函数的方程。
直接输入任意的一元方程，然后点击“下一步”按钮，即可获得方程的解。
它支持包含数学函数的方程。
总述：本次共解1题。其中
☆方程1题
〖 1/1方程〗
作业：求方程 1/（d+3）+1/（d+5）+1/d = 1/（d+7） 的解.
题型：方程
解:原方程：
| 1 | ÷ | ( | d | + | 3 | ) | + | 1 | ÷ | ( | d | + | 5 | ) | + | 1 | ÷ | d | = | 1 | ÷ | ( | d | + | 7 | ) |
| 方程两边同时乘以： | ( | d | + | 3 | ) | , | ( | d | + | 7 | ) |
| 1 | ( | d | + | 7 | ) | + | 1 | ÷ | ( | d | + | 5 | ) | × | ( | d | + | 3 | ) | ( | d | + | 7 | ) | + | 1 | ÷ | d | × | ( | d | + | 3 | ) | ( | d | + | 7 | ) | = | 1 | ( | d | + | 3 | ) |
| 1 | d | + | 1 | × | 7 | + | 1 | ÷ | ( | d | + | 5 | ) | × | ( | d | + | 3 | ) | ( | d | + | 7 | ) | + | 1 | ÷ | d | × | ( | d | + | 3 | ) | ( | d | + | 7 | ) | = | 1 | ( | d | + | 3 | ) |
| 1 | d | + | 1 | × | 7 | + | 1 | ÷ | ( | d | + | 5 | ) | × | ( | d | + | 3 | ) | ( | d | + | 7 | ) | + | 1 | ÷ | d | × | ( | d | + | 3 | ) | ( | d | + | 7 | ) | = | 1 | d | + | 1 | × | 3 |
| 1 | d | + | 7 | + | 1 | ÷ | ( | d | + | 5 | ) | × | ( | d | + | 3 | ) | ( | d | + | 7 | ) | + | 1 | ÷ | d | × | ( | d | + | 3 | ) | ( | d | + | 7 | ) | = | 1 | d | + | 3 |
| 方程两边同时乘以： | ( | d | + | 5 | ) |
| 1 | d | ( | d | + | 5 | ) | + | 7 | ( | d | + | 5 | ) | + | 1 | ( | d | + | 3 | ) | ( | d | + | 7 | ) | + | 1 | ÷ | d | × | ( | d | + | 3 | ) | ( | d | + | 7 | ) | = | 1 | d | ( | d | + | 5 | ) | + | 3 | ( | d | + | 5 | ) |
| 1 | d | d | + | 1 | d | × | 5 | + | 7 | ( | d | + | 5 | ) | + | 1 | ( | d | + | 3 | ) | ( | d | + | 7 | ) | + | 1 | = | 1 | d | ( | d | + | 5 | ) | + | 3 | ( | d | + | 5 | ) |
| 1 | d | d | + | 1 | d | × | 5 | + | 7 | ( | d | + | 5 | ) | + | 1 | ( | d | + | 3 | ) | ( | d | + | 7 | ) | + | 1 | = | 1 | d | d | + | 1 | d | × | 5 | + | 3 | ( | d | + | 5 | ) |
| 1 | d | d | + | 5 | d | + | 7 | ( | d | + | 5 | ) | + | 1 | ( | d | + | 3 | ) | ( | d | + | 7 | ) | + | 1 | ÷ | d | = | 1 | d | d | + | 5 | d | + | 3 | ( | d | + | 5 | ) |
| 方程两边同时乘以： | d |
| 1 | d | d | d | + | 5 | d | d | + | 7 | ( | d | + | 5 | ) | d | + | 1 | ( | d | + | 3 | ) | = | 1 | d | d | d | + | 5 | d | d | + | 3 | ( | d | + | 5 | ) | d |
| 1 | d | d | d | + | 5 | d | d | + | 7 | d | d | + | 7 | × | 5 | = | 1 | d | d | d | + | 5 | d | d | + | 3 | ( | d | + | 5 | ) | d |
| 1 | d | d | d | + | 5 | d | d | + | 7 | d | d | + | 7 | × | 5 | = | 1 | d | d | d | + | 5 | d | d | + | 3 | d | d | + | 3 | × | 5 |
| 1 | d | d | d | + | 5 | d | d | + | 7 | d | d | + | 35 | d | = | 1 | d | d | d | + | 5 | d | d | + | 3 | d | d | + | 15 | d |
| 1 | d | d | d | + | 5 | d | d | + | 7 | d | d | + | 35 | d | = | 1 | d | d | d | + | 5 | d | d | + | 3 | d | d | + | 15 | d |
| 1 | d | d | d | + | 5 | d | d | + | 7 | d | d | + | 35 | d | = | 1 | d | d | d | + | 5 | d | d | + | 3 | d | d | + | 15 | d |
| 1 | d | d | d | + | 5 | d | d | + | 7 | d | d | + | 35 | d | = | 1 | d | d | d | + | 5 | d | d | + | 3 | d | d | + | 15 | d |
| 1 | d | d | d | + | 5 | d | d | + | 7 | d | d | + | 35 | d | = | 1 | d | d | d | + | 5 | d | d | + | 3 | d | d | + | 15 | d |
| 1 | d | d | d | + | 5 | d | d | + | 7 | d | d | + | 35 | d | = | 1 | d | d | d | + | 5 | d | d | + | 3 | d | d | + | 15 | d |
| 1 | d | d | d | + | 5 | d | d | + | 7 | d | d | + | 35 | d | = | 1 | d | d | d | + | 5 | d | d | + | 3 | d | d | + | 15 | d |
| 1 | d | d | d | + | 5 | d | d | + | 7 | d | d | + | 56 | d | = | 1 | d | d | d | + | 5 | d | d | + | 3 | d | d | + | 15 | d |
| 1 | d | d | d | + | 5 | d | d | + | 7 | d | d | + | 56 | d | = | 1 | d | d | d | + | 5 | d | d | + | 3 | d | d | + | 15 | d |
| 1 | d | d | d | + | 5 | d | d | + | 7 | d | d | + | 56 | d | = | 1 | d | d | d | + | 5 | d | d | + | 3 | d | d | + | 15 | d |
| 1 | d | d | d | + | 5 | d | d | + | 7 | d | d | + | 56 | d | = | 1 | d | d | d | + | 5 | d | d | + | 3 | d | d | + | 15 | d |
方程的解为：
d1≈-8.833060 ，保留6位小数
d2≈-4.277413 ，保留6位小数
d3≈-1.389527 ，保留6位小数
有 3个解。
解程的详细方法请参阅：《方程的解法》
你的问题在这里没有得到解决？请到 热门难题 里面看看吧！
最 新 发 布
新增加身体健康评估计算器，位置：“数学运算 > 身体健康评估”。
新增加学习笔记(安卓版)百度网盘快速下载应用程序，欢迎使用。
新增加学习笔记(安卓版)本站下载应用程序，欢迎使用。
新增线性代数行列式的计算，欢迎使用。
数学计算和一元方程已经支持正割函数和余割函数，欢迎使用。
新增加贷款计算器模块（具体位置：数学运算 > 贷款计算器），欢迎使用。