总述:本次共解1题。其中
☆方程1题
〖 1/1方程〗
作业:求方程 1+(1+x)+(1+x)2+(1+x)3+(1+x)4+(1+x)5+(1+x)6+(1+x)7 = 11.67 的解.
题型:方程
解:原方程:| | 1 | + | ( | 1 | + | x | ) | + | ( | 1 | + | x | ) | × | 2 | + | ( | 1 | + | x | ) | × | 3 | + | ( | 1 | + | x | ) | × | 4 | + | ( | 1 | + | x | ) | × | 5 | + | ( | 1 | + | x | ) | × | 6 | = | 1167 100 |
去掉方程左边的括号:
| 方程左边 = | 1 | + | 1 | + | x | + | ( | 1 | + | x | ) | × | 2 | + | ( | 1 | + | x | ) | × | 3 | + | ( | 1 | + | x | ) | × | 4 | + | ( | 1 | + | x | ) | × | 5 | + | ( | 1 | + | x | ) |
| = | 2 | + | x | + | ( | 1 | + | x | ) | × | 2 | + | ( | 1 | + | x | ) | × | 3 | + | ( | 1 | + | x | ) | × | 4 | + | ( | 1 | + | x | ) | × | 5 | + | ( | 1 | + | x | ) | × | 6 |
| = | 2 | + | x | + | 1 | × | 2 | + | x | × | 2 | + | ( | 1 | + | x | ) | × | 3 | + | ( | 1 | + | x | ) | × | 4 | + | ( | 1 | + | x | ) | × | 5 |
| = | 2 | + | x | + | 2 | + | x | × | 2 | + | ( | 1 | + | x | ) | × | 3 | + | ( | 1 | + | x | ) | × | 4 | + | ( | 1 | + | x | ) | × | 5 | + | ( | 1 | + | x | ) |
| = | 4 | + | 3 | x | + | ( | 1 | + | x | ) | × | 3 | + | ( | 1 | + | x | ) | × | 4 | + | ( | 1 | + | x | ) | × | 5 | + | ( | 1 | + | x | ) | × | 6 | + | ( | 1 | + | x | ) |
| = | 4 | + | 3 | x | + | 1 | × | 3 | + | x | × | 3 | + | ( | 1 | + | x | ) | × | 4 | + | ( | 1 | + | x | ) | × | 5 | + | ( | 1 | + | x | ) |
| = | 4 | + | 3 | x | + | 3 | + | x | × | 3 | + | ( | 1 | + | x | ) | × | 4 | + | ( | 1 | + | x | ) | × | 5 | + | ( | 1 | + | x | ) | × | 6 |
| = | 7 | + | 6 | x | + | ( | 1 | + | x | ) | × | 4 | + | ( | 1 | + | x | ) | × | 5 | + | ( | 1 | + | x | ) | × | 6 | + | ( | 1 | + | x | ) | × | 7 |
| = | 7 | + | 6 | x | + | 1 | × | 4 | + | x | × | 4 | + | ( | 1 | + | x | ) | × | 5 | + | ( | 1 | + | x | ) | × | 6 | + | ( | 1 | + | x | ) |
| = | 7 | + | 6 | x | + | 4 | + | x | × | 4 | + | ( | 1 | + | x | ) | × | 5 | + | ( | 1 | + | x | ) | × | 6 | + | ( | 1 | + | x | ) | × | 7 |
| = | 11 | + | 10 | x | + | ( | 1 | + | x | ) | × | 5 | + | ( | 1 | + | x | ) | × | 6 | + | ( | 1 | + | x | ) | × | 7 |
| = | 11 | + | 10 | x | + | 1 | × | 5 | + | x | × | 5 | + | ( | 1 | + | x | ) | × | 6 | + | ( | 1 | + | x | ) | × | 7 |
| = | 11 | + | 10 | x | + | 5 | + | x | × | 5 | + | ( | 1 | + | x | ) | × | 6 | + | ( | 1 | + | x | ) | × | 7 |
| = | 16 | + | 15 | x | + | ( | 1 | + | x | ) | × | 6 | + | ( | 1 | + | x | ) | × | 7 |
| = | 16 | + | 15 | x | + | 1 | × | 6 | + | x | × | 6 | + | ( | 1 | + | x | ) | × | 7 |
| = | 16 | + | 15 | x | + | 6 | + | x | × | 6 | + | ( | 1 | + | x | ) | × | 7 |
| = | 22 | + | 21 | x | + | ( | 1 | + | x | ) | × | 7 |
| = | 22 | + | 21 | x | + | 1 | × | 7 | + | x | × | 7 |
方程化为:
移项:即,把含有未知数的项移到方程左边,把只含有常数的项移到方程的右边。
注意,移项时,该项前面的正负号要改变,即,正号变为负号,而负号要改变为正号。这与方程两边同时加上或者减去该项是等价的。
合并方程右边的各项:
把未知数的系数化为 1:
得:
把结果化为小数形式:
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