总述:本次共解1题。其中
☆方程1题
〖 1/1方程〗
作业:求方程 (x-3)(x-6)(x-4)(-x-2) = 0 的解.
题型:方程
解:原方程:| | ( | x | − | 3 | ) | ( | x | − | 6 | ) | ( | x | − | 4 | ) | ( | - | x | − | 2 | ) | = | 0 |
去掉方程左边的括号:
| 方程左边 = | x | ( | x | − | 6 | ) | ( | x | − | 4 | ) | ( | - | x | − | 2 | ) | − | 3 | ( | x | − | 6 | ) | ( | x | − | 4 | ) | ( | - | x | − | 2 | ) |
| = | x | x | ( | x | − | 4 | ) | ( | - | x | − | 2 | ) | − | x | × | 6 | ( | x | − | 4 | ) | ( | - | x | − | 2 | ) | − | 3 | ( | x | − | 6 | ) | ( | x | − | 4 | ) | ( | - | x | − | 2 | ) |
| = | x | x | x | ( | - | x | − | 2 | ) | − | x | x | × | 4 | ( | - | x | − | 2 | ) | − | x | × | 6 | ( | x | − | 4 | ) | ( | - | x | − | 2 | ) |
| = | - | x | x | x | x | − | x | x | x | × | 2 | − | x | x | × | 4 | ( | - | x | − | 2 | ) |
| = | - | x | x | x | x | − | x | x | x | × | 2 | + | x | x | × | 4 | x |
| = | - | x | x | x | x | − | x | x | x | × | 2 | + | x | x | × | 4 | x |
| = | - | x | x | x | x | − | x | x | x | × | 2 | + | x | x | × | 4 | x |
| = | - | x | x | x | x | − | x | x | x | × | 2 | + | x | x | × | 4 | x |
| = | - | x | x | x | x | − | x | x | x | × | 2 | + | x | x | × | 4 | x |
| = | - | x | x | x | x | − | x | x | x | × | 2 | + | x | x | × | 4 | x |
| = | - | x | x | x | x | − | x | x | x | × | 2 | + | x | x | × | 4 | x |
| = | - | x | x | x | x | − | x | x | x | × | 2 | + | x | x | × | 4 | x |
| = | - | x | x | x | x | − | x | x | x | × | 2 | + | x | x | × | 4 | x |
| = | - | x | x | x | x | − | x | x | x | × | 2 | + | x | x | × | 4 | x |
| = | - | x | x | x | x | − | x | x | x | × | 2 | + | x | x | × | 4 | x |
| = | - | x | x | x | x | − | x | x | x | × | 2 | + | x | x | × | 4 | x |
| = | - | x | x | x | x | − | x | x | x | × | 2 | + | x | x | × | 4 | x |
| = | - | x | x | x | x | − | x | x | x | × | 2 | + | x | x | × | 4 | x |
| = | - | x | x | x | x | − | x | x | x | × | 2 | + | x | x | × | 4 | x |
| = | - | x | x | x | x | − | x | x | x | × | 2 | + | x | x | × | 4 | x |
| = | - | x | x | x | x | − | x | x | x | × | 2 | + | x | x | × | 4 | x |
| = | - | x | x | x | x | − | x | x | x | × | 2 | + | x | x | × | 4 | x |
| = | - | x | x | x | x | − | x | x | x | × | 2 | + | x | x | × | 4 | x |
| = | - | x | x | x | x | − | x | x | x | × | 2 | + | x | x | × | 4 | x |
| = | - | x | x | x | x | − | x | x | x | × | 2 | + | x | x | × | 4 | x |
方程化为一般式后,用因式分解法化为:
( x + 2 )( x - 3 )( x - 4 )( x - 6 )=0
由
x + 2 = 0
x - 3 = 0
x - 4 = 0
x - 6 = 0
得:
x1=-2
x2=3
x3=4
x4=6
有 4个解。
解程的详细方法请参阅:《方程的解法》
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