总述:本次共解1题。其中
☆方程1题
〖 1/1方程〗
作业:求方程 (x-7)/(x-9)+(x-15)/(x-17) = (x-13)/(x-15)+(x-9)/(x-11) 的解.
题型:方程
解:原方程:| | ( | x | − | 7 | ) | ÷ | ( | x | − | 9 | ) | + | ( | x | − | 15 | ) | ÷ | ( | x | − | 17 | ) | = | ( | x | − | 13 | ) | ÷ | ( | x | − | 15 | ) | + | ( | x | − | 9 | ) | ÷ | ( | x | − | 11 | ) |
| 方程两边同时乘以: | ( | x | − | 9 | ) | , | ( | x | − | 15 | ) |
| | ( | x | − | 7 | ) | ( | x | − | 15 | ) | + | ( | x | − | 15 | ) | ÷ | ( | x | − | 17 | ) | × | ( | x | − | 9 | ) | ( | x | − | 15 | ) | = | ( | x | − | 13 | ) | ( | x | − | 9 | ) | + | ( | x | − | 9 | ) | ÷ | ( | x | − | 11 | ) | × | ( | x | − | 9 | ) | ( | x | − | 15 | ) |
去掉方程左边的一个括号:
| | x | ( | x | − | 15 | ) | − | 7 | ( | x | − | 15 | ) | + | ( | x | − | 15 | ) | ÷ | ( | x | − | 17 | ) | × | ( | x | − | 9 | ) | ( | x | − | 15 | ) | = | ( | x | − | 13 | ) | ( | x | − | 9 | ) | + | ( | x | − | 9 | ) | ÷ | ( | x | − | 11 | ) | × | ( | x | − | 9 | ) | ( | x | − | 15 | ) |
去掉方程右边的一个括号:
| | x | ( | x | − | 15 | ) | − | 7 | ( | x | − | 15 | ) | + | ( | x | − | 15 | ) | ÷ | ( | x | − | 17 | ) | × | ( | x | − | 9 | ) | ( | x | − | 15 | ) | = | x | ( | x | − | 9 | ) | − | 13 | ( | x | − | 9 | ) | + | ( | x | − | 9 | ) | ÷ | ( | x | − | 11 | ) | × | ( | x | − | 9 | ) | ( | x | − | 15 | ) |
| 方程两边同时乘以: | ( | x | − | 17 | ) | , | ( | x | − | 11 | ) |
| | x | ( | x | − | 15 | ) | ( | x | − | 17 | ) | ( | x | − | 11 | ) | − | 7 | ( | x | − | 15 | ) | ( | x | − | 17 | ) | ( | x | − | 11 | ) | + | ( | x | − | 15 | ) | ( | x | − | 9 | ) | ( | x | − | 15 | ) | ( | x | − | 11 | ) | = | x | ( | x | − | 9 | ) | ( | x | − | 17 | ) | ( | x | − | 11 | ) | − | 13 | ( | x | − | 9 | ) | ( | x | − | 17 | ) | ( | x | − | 11 | ) | + | ( | x | − | 9 | ) | ( | x | − | 9 | ) | ( | x | − | 15 | ) | ( | x | − | 17 | ) |
去掉方程左边的一个括号:
| | x | x | ( | x | − | 17 | ) | ( | x | − | 11 | ) | − | x | × | 15 | ( | x | − | 17 | ) | ( | x | − | 11 | ) | − | 7 | ( | x | − | 15 | ) | ( | x | − | 17 | ) | ( | x | − | 11 | ) | = | x | ( | x | − | 9 | ) | ( | x | − | 17 | ) | ( | x | − | 11 | ) | − | 13 | ( | x | − | 9 | ) | ( | x | − | 17 | ) | ( | x | − | 11 | ) | + | ( | x | − | 9 | ) | ( | x | − | 9 | ) | ( | x | − | 15 | ) | ( | x | − | 17 | ) |
去掉方程右边的一个括号:
| | x | x | ( | x | − | 17 | ) | ( | x | − | 11 | ) | − | x | × | 15 | ( | x | − | 17 | ) | ( | x | − | 11 | ) | − | 7 | ( | x | − | 15 | ) | ( | x | − | 17 | ) | ( | x | − | 11 | ) | = | x | x | ( | x | − | 17 | ) | ( | x | − | 11 | ) | − | x | × | 9 | ( | x | − | 17 | ) | ( | x | − | 11 | ) | − | 13 | ( | x | − | 9 | ) | ( | x | − | 17 | ) | ( | x | − | 11 | ) |
去掉方程左边的一个括号:
| | x | x | x | ( | x | − | 11 | ) | − | x | x | × | 17 | ( | x | − | 11 | ) | − | x | × | 15 | ( | x | − | 17 | ) | ( | x | − | 11 | ) | = | x | x | ( | x | − | 17 | ) | ( | x | − | 11 | ) | − | x | × | 9 | ( | x | − | 17 | ) | ( | x | − | 11 | ) | − | 13 | ( | x | − | 9 | ) | ( | x | − | 17 | ) | ( | x | − | 11 | ) |
去掉方程右边的一个括号:
| | x | x | x | ( | x | − | 11 | ) | − | x | x | × | 17 | ( | x | − | 11 | ) | − | x | × | 15 | ( | x | − | 17 | ) | ( | x | − | 11 | ) | = | x | x | x | ( | x | − | 11 | ) | − | x | x | × | 17 | ( | x | − | 11 | ) | − | x | × | 9 | ( | x | − | 17 | ) | ( | x | − | 11 | ) |
去掉方程左边的一个括号:
| | x | x | x | x | − | x | x | x | × | 11 | − | x | x | × | 17 | ( | x | − | 11 | ) | = | x | x | x | ( | x | − | 11 | ) | − | x | x | × | 17 | ( | x | − | 11 | ) | − | x | × | 9 | ( | x | − | 17 | ) | ( | x | − | 11 | ) |
去掉方程右边的一个括号:
| | x | x | x | x | − | x | x | x | × | 11 | − | x | x | × | 17 | ( | x | − | 11 | ) | = | x | x | x | x | − | x | x | x | × | 11 | − | x | x | × | 17 | ( | x | − | 11 | ) |
去掉方程左边的一个括号:
| | x | x | x | x | − | x | x | x | × | 11 | − | x | x | × | 17 | x | = | x | x | x | x | − | x | x | x | × | 11 | − | x | x | × | 17 | ( | x | − | 11 | ) |
去掉方程右边的一个括号:
| | x | x | x | x | − | x | x | x | × | 11 | − | x | x | × | 17 | x | = | x | x | x | x | − | x | x | x | × | 11 | − | x | x | × | 17 | x |
方程化简为:
| | x | x | x | x | − | x | x | x | × | 11 | − | x | x | × | 17 | x | = | x | x | x | x | − | x | x | x | × | 11 | − | x | x | × | 17 | x |
去掉方程左边的一个括号:
| | x | x | x | x | − | x | x | x | × | 11 | − | x | x | × | 17 | x | = | x | x | x | x | − | x | x | x | × | 11 | − | x | x | × | 17 | x |
去掉方程右边的一个括号:
| | x | x | x | x | − | x | x | x | × | 11 | − | x | x | × | 17 | x | = | x | x | x | x | − | x | x | x | × | 11 | − | x | x | × | 17 | x |
方程化简为:
| | x | x | x | x | − | x | x | x | × | 11 | − | x | x | × | 17 | x | = | x | x | x | x | − | x | x | x | × | 11 | − | x | x | × | 17 | x |
去掉方程左边的一个括号:
| | x | x | x | x | − | x | x | x | × | 11 | − | x | x | × | 17 | x | = | x | x | x | x | − | x | x | x | × | 11 | − | x | x | × | 17 | x |
去掉方程右边的一个括号:
| | x | x | x | x | − | x | x | x | × | 11 | − | x | x | × | 17 | x | = | x | x | x | x | − | x | x | x | × | 11 | − | x | x | × | 17 | x |
方程化简为:
| | x | x | x | x | − | x | x | x | × | 11 | − | x | x | × | 17 | x | = | x | x | x | x | − | x | x | x | × | 11 | − | x | x | × | 17 | x |
去掉方程左边的一个括号:
| | x | x | x | x | − | x | x | x | × | 11 | − | x | x | × | 17 | x | = | x | x | x | x | − | x | x | x | × | 11 | − | x | x | × | 17 | x |
去掉方程右边的一个括号:
| | x | x | x | x | − | x | x | x | × | 11 | − | x | x | × | 17 | x | = | x | x | x | x | − | x | x | x | × | 11 | − | x | x | × | 17 | x |
方程化简为:
| | x | x | x | x | − | x | x | x | × | 11 | − | x | x | × | 17 | x | = | x | x | x | x | − | x | x | x | × | 11 | − | x | x | × | 17 | x |
x1=13
有 1个解。
解一元一次方程的详细方法请参阅:《一元一次方程的解法》
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