总述:本次共解1题。其中
☆方程1题
〖 1/1方程〗
作业:求方程 (x-8)/(x-10)+(2x-8)/(x-6) = (x-5)/(x-7)+(2x-14)/(x-9) 的解.
题型:方程
解:原方程:| | ( | x | − | 8 | ) | ÷ | ( | x | − | 10 | ) | + | ( | 2 | x | − | 8 | ) | ÷ | ( | x | − | 6 | ) | = | ( | x | − | 5 | ) | ÷ | ( | x | − | 7 | ) | + | ( | 2 | x | − | 14 | ) | ÷ | ( | x | − | 9 | ) |
| 方程两边同时乘以: | ( | x | − | 10 | ) | , | ( | x | − | 7 | ) |
| | ( | x | − | 8 | ) | ( | x | − | 7 | ) | + | ( | 2 | x | − | 8 | ) | ÷ | ( | x | − | 6 | ) | × | ( | x | − | 10 | ) | ( | x | − | 7 | ) | = | ( | x | − | 5 | ) | ( | x | − | 10 | ) | + | ( | 2 | x | − | 14 | ) | ÷ | ( | x | − | 9 | ) | × | ( | x | − | 10 | ) | ( | x | − | 7 | ) |
去掉方程左边的一个括号:
| | x | ( | x | − | 7 | ) | − | 8 | ( | x | − | 7 | ) | + | ( | 2 | x | − | 8 | ) | ÷ | ( | x | − | 6 | ) | × | ( | x | − | 10 | ) | ( | x | − | 7 | ) | = | ( | x | − | 5 | ) | ( | x | − | 10 | ) | + | ( | 2 | x | − | 14 | ) | ÷ | ( | x | − | 9 | ) | × | ( | x | − | 10 | ) | ( | x | − | 7 | ) |
去掉方程右边的一个括号:
| | x | ( | x | − | 7 | ) | − | 8 | ( | x | − | 7 | ) | + | ( | 2 | x | − | 8 | ) | ÷ | ( | x | − | 6 | ) | × | ( | x | − | 10 | ) | ( | x | − | 7 | ) | = | x | ( | x | − | 10 | ) | − | 5 | ( | x | − | 10 | ) | + | ( | 2 | x | − | 14 | ) | ÷ | ( | x | − | 9 | ) | × | ( | x | − | 10 | ) | ( | x | − | 7 | ) |
| 方程两边同时乘以: | ( | x | − | 6 | ) | , | ( | x | − | 9 | ) |
| | x | ( | x | − | 7 | ) | ( | x | − | 6 | ) | ( | x | − | 9 | ) | − | 8 | ( | x | − | 7 | ) | ( | x | − | 6 | ) | ( | x | − | 9 | ) | + | ( | 2 | x | − | 8 | ) | ( | x | − | 10 | ) | ( | x | − | 7 | ) | ( | x | − | 9 | ) | = | x | ( | x | − | 10 | ) | ( | x | − | 6 | ) | ( | x | − | 9 | ) | − | 5 | ( | x | − | 10 | ) | ( | x | − | 6 | ) | ( | x | − | 9 | ) | + | ( | 2 | x | − | 14 | ) | ( | x | − | 10 | ) | ( | x | − | 7 | ) | ( | x | − | 6 | ) |
去掉方程左边的一个括号:
| | x | x | ( | x | − | 6 | ) | ( | x | − | 9 | ) | − | x | × | 7 | ( | x | − | 6 | ) | ( | x | − | 9 | ) | − | 8 | ( | x | − | 7 | ) | ( | x | − | 6 | ) | ( | x | − | 9 | ) | = | x | ( | x | − | 10 | ) | ( | x | − | 6 | ) | ( | x | − | 9 | ) | − | 5 | ( | x | − | 10 | ) | ( | x | − | 6 | ) | ( | x | − | 9 | ) | + | ( | 2 | x | − | 14 | ) | ( | x | − | 10 | ) | ( | x | − | 7 | ) | ( | x | − | 6 | ) |
去掉方程右边的一个括号:
| | x | x | ( | x | − | 6 | ) | ( | x | − | 9 | ) | − | x | × | 7 | ( | x | − | 6 | ) | ( | x | − | 9 | ) | − | 8 | ( | x | − | 7 | ) | ( | x | − | 6 | ) | ( | x | − | 9 | ) | = | x | x | ( | x | − | 6 | ) | ( | x | − | 9 | ) | − | x | × | 10 | ( | x | − | 6 | ) | ( | x | − | 9 | ) | − | 5 | ( | x | − | 10 | ) | ( | x | − | 6 | ) | ( | x | − | 9 | ) |
去掉方程左边的一个括号:
| | x | x | x | ( | x | − | 9 | ) | − | x | x | × | 6 | ( | x | − | 9 | ) | − | x | × | 7 | ( | x | − | 6 | ) | ( | x | − | 9 | ) | = | x | x | ( | x | − | 6 | ) | ( | x | − | 9 | ) | − | x | × | 10 | ( | x | − | 6 | ) | ( | x | − | 9 | ) | − | 5 | ( | x | − | 10 | ) | ( | x | − | 6 | ) | ( | x | − | 9 | ) |
去掉方程右边的一个括号:
| | x | x | x | ( | x | − | 9 | ) | − | x | x | × | 6 | ( | x | − | 9 | ) | − | x | × | 7 | ( | x | − | 6 | ) | ( | x | − | 9 | ) | = | x | x | x | ( | x | − | 9 | ) | − | x | x | × | 6 | ( | x | − | 9 | ) | − | x | × | 10 | ( | x | − | 6 | ) | ( | x | − | 9 | ) |
去掉方程左边的一个括号:
| | x | x | x | x | − | x | x | x | × | 9 | − | x | x | × | 6 | ( | x | − | 9 | ) | = | x | x | x | ( | x | − | 9 | ) | − | x | x | × | 6 | ( | x | − | 9 | ) | − | x | × | 10 | ( | x | − | 6 | ) | ( | x | − | 9 | ) |
去掉方程右边的一个括号:
| | x | x | x | x | − | x | x | x | × | 9 | − | x | x | × | 6 | ( | x | − | 9 | ) | = | x | x | x | x | − | x | x | x | × | 9 | − | x | x | × | 6 | ( | x | − | 9 | ) |
去掉方程左边的一个括号:
| | x | x | x | x | − | x | x | x | × | 9 | − | x | x | × | 6 | x | = | x | x | x | x | − | x | x | x | × | 9 | − | x | x | × | 6 | ( | x | − | 9 | ) |
去掉方程右边的一个括号:
| | x | x | x | x | − | x | x | x | × | 9 | − | x | x | × | 6 | x | = | x | x | x | x | − | x | x | x | × | 9 | − | x | x | × | 6 | x |
方程化简为:
| | x | x | x | x | − | x | x | x | × | 9 | − | x | x | × | 6 | x | = | x | x | x | x | − | x | x | x | × | 9 | − | x | x | × | 6 | x |
去掉方程左边的一个括号:
| | x | x | x | x | − | x | x | x | × | 9 | − | x | x | × | 6 | x | = | x | x | x | x | − | x | x | x | × | 9 | − | x | x | × | 6 | x |
去掉方程右边的一个括号:
| | x | x | x | x | − | x | x | x | × | 9 | − | x | x | × | 6 | x | = | x | x | x | x | − | x | x | x | × | 9 | − | x | x | × | 6 | x |
方程化简为:
| | x | x | x | x | − | x | x | x | × | 9 | − | x | x | × | 6 | x | = | x | x | x | x | − | x | x | x | × | 9 | − | x | x | × | 6 | x |
去掉方程左边的一个括号:
| | x | x | x | x | − | x | x | x | × | 9 | − | x | x | × | 6 | x | = | x | x | x | x | − | x | x | x | × | 9 | − | x | x | × | 6 | x |
去掉方程右边的一个括号:
| | x | x | x | x | − | x | x | x | × | 9 | − | x | x | × | 6 | x | = | x | x | x | x | − | x | x | x | × | 9 | − | x | x | × | 6 | x |
方程化简为:
| | x | x | x | x | − | x | x | x | × | 9 | − | x | x | × | 6 | x | = | x | x | x | x | − | x | x | x | × | 9 | − | x | x | × | 6 | x |
去掉方程左边的一个括号:
| | x | x | x | x | − | x | x | x | × | 9 | − | x | x | × | 6 | x | = | x | x | x | x | − | x | x | x | × | 9 | − | x | x | × | 6 | x |
去掉方程右边的一个括号:
| | x | x | x | x | − | x | x | x | × | 9 | − | x | x | × | 6 | x | = | x | x | x | x | − | x | x | x | × | 9 | − | x | x | × | 6 | x |
方程化简为:
| | x | x | x | x | − | x | x | x | × | 9 | − | x | x | × | 6 | x | = | x | x | x | x | − | x | x | x | × | 9 | − | x | x | × | 6 | x |
方程的解为:
x1≈7.438447 ,保留6位小数
x2≈11.561553 ,保留6位小数
有 2个解。
解程的详细方法请参阅:《方程的解法》
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