总述:本次共解1题。其中
☆方程1题
〖 1/1方程〗
作业:求方程 (x+1)(x+3.5)(x+2)(x+4)+x(x+3.5)(x+2)(x+4)+x(x+3.5)(x+1)(x+4)+x(x+3.5)(x+1)(x+2) = 0 的解.
题型:方程
解:原方程:| | ( | x | + | 1 | ) | ( | x | + | 7 2 | ) | ( | x | + | 2 | ) | ( | x | + | 4 | ) | + | x | ( | x | + | 7 2 | ) | ( | x | + | 2 | ) | ( | x | + | 4 | ) | + | x | ( | x | + | 7 2 | ) | ( | x | + | 1 | ) | ( | x | + | 4 | ) | = | 0 |
去掉方程左边的括号:
| 方程左边 = | x | ( | x | + | 7 2 | ) | ( | x | + | 2 | ) | ( | x | + | 4 | ) | + | 1 | ( | x | + | 7 2 | ) | ( | x | + | 2 | ) | ( | x | + | 4 | ) | + | x | ( | x | + | 7 2 | ) | ( | x | + | 2 | ) | ( | x | + | 4 | ) |
| = | x | x | ( | x | + | 2 | ) | ( | x | + | 4 | ) | + | x | × | 7 2 | ( | x | + | 2 | ) | ( | x | + | 4 | ) | + | 1 | ( | x | + | 7 2 | ) | ( | x | + | 2 | ) | ( | x | + | 4 | ) |
| = | x | x | x | ( | x | + | 4 | ) | + | x | x | × | 2 | ( | x | + | 4 | ) | + | x | × | 7 2 | ( | x | + | 2 | ) | ( | x | + | 4 | ) |
| = | x | x | x | x | + | x | x | x | × | 4 | + | x | x | × | 2 | ( | x | + | 4 | ) |
| = | x | x | x | x | + | x | x | x | × | 4 | + | x | x | × | 2 | x |
| = | x | x | x | x | + | x | x | x | × | 4 | + | x | x | × | 2 | x |
| = | x | x | x | x | + | x | x | x | × | 4 | + | x | x | × | 2 | x |
| = | x | x | x | x | + | x | x | x | × | 4 | + | x | x | × | 2 | x |
| = | x | x | x | x | + | x | x | x | × | 4 | + | x | x | × | 2 | x |
| = | x | x | x | x | + | x | x | x | × | 4 | + | x | x | × | 2 | x |
| = | x | x | x | x | + | x | x | x | × | 4 | + | x | x | × | 2 | x |
| = | x | x | x | x | + | x | x | x | × | 4 | + | x | x | × | 2 | x |
| = | x | x | x | x | + | x | x | x | × | 4 | + | x | x | × | 2 | x |
| = | x | x | x | x | + | x | x | x | × | 4 | + | x | x | × | 2 | x |
| = | x | x | x | x | + | x | x | x | × | 4 | + | x | x | × | 2 | x |
| = | x | x | x | x | + | x | x | x | × | 4 | + | x | x | × | 2 | x |
| = | x | x | x | x | + | x | x | x | × | 4 | + | x | x | × | 2 | x |
| = | x | x | x | x | + | x | x | x | × | 4 | + | x | x | × | 2 | x |
| = | x | x | x | x | + | x | x | x | × | 4 | + | x | x | × | 2 | x |
| = | x | x | x | x | + | x | x | x | × | 4 | + | x | x | × | 2 | x |
| = | x | x | x | x | + | x | x | x | × | 4 | + | x | x | × | 2 | x |
| = | x | x | x | x | + | x | x | x | × | 4 | + | x | x | × | 2 | x |
| = | x | x | x | x | + | x | x | x | × | 4 | + | x | x | × | 2 | x |
| = | x | x | x | x | + | x | x | x | × | 4 | + | x | x | × | 2 | x |
| = | x | x | x | x | + | x | x | x | × | 4 | + | x | x | × | 2 | x |
方程化为一般式后,有公因式:
( 2x + 7 )
由
2x + 7 = 0
得:
不能由因式分解法得出的解:
x2≈-3.326345 ,保留6位小数
x3≈-1.530907 ,保留6位小数
x4≈-0.392748 ,保留6位小数
有 4个解。
解程的详细方法请参阅:《方程的解法》
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