总述:本次共解1题。其中
☆方程1题
〖 1/1方程〗
作业:求方程 (x+29)*(x-5)*(x-25)+160*18+240*12+720*(x-5)-96*(x+29)+120*(x-25) = 0 的解.
题型:方程
解:原方程:| | ( | x | + | 29 | ) | ( | x | − | 5 | ) | ( | x | − | 25 | ) | + | 160 | × | 18 | + | 240 | × | 12 | + | 720 | ( | x | − | 5 | ) | − | 96 | ( | x | + | 29 | ) | + | 120 | = | 0 |
| 方程左边 = | ( | x | + | 29 | ) | ( | x | − | 5 | ) | ( | x | − | 25 | ) | + | 2880 | + | 2880 | + | 720 | ( | x | − | 5 | ) | − | 96 | ( | x | + | 29 | ) | + | 120 | ( | x | − | 25 | ) |
| = | ( | x | + | 29 | ) | ( | x | − | 5 | ) | ( | x | − | 25 | ) | + | 5760 | + | 720 | ( | x | − | 5 | ) | − | 96 | ( | x | + | 29 | ) | + | 120 | ( | x | − | 25 | ) |
方程化为:
| | ( | x | + | 29 | ) | ( | x | − | 5 | ) | ( | x | − | 25 | ) | + | 5760 | + | 720 | ( | x | − | 5 | ) | − | 96 | ( | x | + | 29 | ) | + | 120 | ( | x | − | 25 | ) | = | 0 |
去掉方程左边的括号:
| 方程左边 = | x | ( | x | − | 5 | ) | ( | x | − | 25 | ) | + | 29 | ( | x | − | 5 | ) | ( | x | − | 25 | ) | + | 5760 | + | 720 | ( | x | − | 5 | ) | − | 96 | ( | x | + | 29 | ) | + | 120 |
| = | x | x | ( | x | − | 25 | ) | − | x | × | 5 | ( | x | − | 25 | ) | + | 29 | ( | x | − | 5 | ) | ( | x | − | 25 | ) | + | 5760 | + | 720 | ( | x | − | 5 | ) |
| = | x | x | x | − | x | x | × | 25 | − | x | × | 5 | ( | x | − | 25 | ) | + | 29 | ( | x | − | 5 | ) | ( | x | − | 25 | ) |
| = | x | x | x | − | x | x | × | 25 | − | x | × | 5 | x | + | x | × | 5 | × | 25 |
| = | x | x | x | − | x | x | × | 25 | − | x | × | 5 | x | + | x | × | 125 | + | 29 |
| = | x | x | x | − | x | x | × | 25 | − | x | × | 5 | x | + | 125 | x | + | 29 |
| = | x | x | x | − | x | x | × | 25 | − | x | × | 5 | x | + | 125 | x | + | 29 |
| = | x | x | x | − | x | x | × | 25 | − | x | × | 5 | x | + | 125 | x | + | 29 |
| = | x | x | x | − | x | x | × | 25 | − | x | × | 5 | x | + | 125 | x | + | 29 |
| = | x | x | x | − | x | x | × | 25 | − | x | × | 5 | x | − | 600 | x | + | 29 |
| = | x | x | x | − | x | x | × | 25 | − | x | × | 5 | x | − | 600 | x | + | 29 |
| = | x | x | x | − | x | x | × | 25 | − | x | × | 5 | x | − | 600 | x | + | 29 |
| = | x | x | x | − | x | x | × | 25 | − | x | × | 5 | x | − | 745 | x | + | 29 |
| = | x | x | x | − | x | x | × | 25 | − | x | × | 5 | x | − | 745 | x | + | 29 |
| = | x | x | x | − | x | x | × | 25 | − | x | × | 5 | x | − | 745 | x | + | 29 |
| = | x | x | x | − | x | x | × | 25 | − | x | × | 5 | x | − | 25 | x | + | 29 |
| = | x | x | x | − | x | x | × | 25 | − | x | × | 5 | x | − | 25 | x | + | 29 |
| = | x | x | x | − | x | x | × | 25 | − | x | × | 5 | x | − | 25 | x | + | 29 |
| = | x | x | x | − | x | x | × | 25 | − | x | × | 5 | x | − | 121 | x | + | 29 |
| = | x | x | x | − | x | x | × | 25 | − | x | × | 5 | x | − | 121 | x | + | 29 |
| = | x | x | x | − | x | x | × | 25 | − | x | × | 5 | x | − | 121 | x | + | 29 |
| = | x | x | x | − | x | x | × | 25 | − | x | × | 5 | x | − | 1 | x | + | 29 |
方程化为一般式后,用因式分解法化为:
( x + 1 )( x - 1 )( x - 1 )=0
由
x + 1 = 0
x - 1 = 0
x - 1 = 0
得:
x1=-1
x2=1
x3=1
有 3个解。
解程的详细方法请参阅:《方程的解法》
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