总述:本次共解1题。其中
☆方程1题
〖 1/1方程〗
作业:求方程 700*(1+a/100)*24+800*24*(1+2a/100)*(1+a/100) = 21600*(1+20/9*a/100) 的解.
题型:方程
解:原方程:| | 700 | ( | 1 | + | a | ÷ | 100 | ) | × | 24 | + | 800 | × | 24 | ( | 1 | + | 2 | a | ÷ | 100 | ) | ( | 1 | + | a | ÷ | 100 | ) | = | 21600 | ( | 1 | + | 20 | ÷ | 9 | × | a | ÷ | 100 | ) |
| 方程左边 = | 16800 | ( | 1 | + | a | ÷ | 100 | ) | + | 19200 | ( | 1 | + | 2 | a | ÷ | 100 | ) | ( | 1 | + | a | ÷ | 100 | ) |
方程化为:
| | 16800 | ( | 1 | + | a | ÷ | 100 | ) | + | 19200 | ( | 1 | + | 2 | a | ÷ | 100 | ) | ( | 1 | + | a | ÷ | 100 | ) | = | 21600 | ( | 1 | + | 20 | ÷ | 9 | × | a | ÷ | 100 | ) |
去掉方程左边的括号:
| 方程左边 = | 16800 | × | 1 | + | 16800 | a | ÷ | 100 | + | 19200 | ( | 1 | + | 2 | a | ÷ | 100 | ) | ( | 1 | + | a | ÷ | 100 | ) |
| = | 16800 | + | 168 | a | + | 19200 | ( | 1 | + | 2 | a | ÷ | 100 | ) | ( | 1 | + | a | ÷ | 100 | ) |
| = | 16800 | + | 168 | a | + | 19200 | × | 1 | ( | 1 | + | a | ÷ | 100 | ) | + | 19200 | × | 2 | a | ÷ | 100 | × | ( | 1 | + | a | ÷ | 100 | ) |
| = | 16800 | + | 168 | a | + | 19200 | ( | 1 | + | a | ÷ | 100 | ) | + | 384 | a | ( | 1 | + | a | ÷ | 100 | ) |
| = | 16800 | + | 168 | a | + | 19200 | × | 1 | + | 19200 | a | ÷ | 100 | + | 384 | a | ( | 1 | + | a | ÷ | 100 | ) |
| = | 16800 | + | 168 | a | + | 19200 | + | 192 | a | + | 384 | a | ( | 1 | + | a | ÷ | 100 | ) |
| = | 36000 | + | 360 | a | + | 384 | a | ( | 1 | + | a | ÷ | 100 | ) |
| = | 36000 | + | 360 | a | + | 384 | a | × | 1 | + | 384 | a | a | ÷ | 100 |
| = | 36000 | + | 360 | a | + | 384 | a | + | 96 25 | a | a |
| = | 36000 | + | 744 | a | + | 96 25 | a | a |
方程化为:
| | 36000 | + | 744 | a | + | 96 25 | a | a | = | 21600 | ( | 1 | + | 20 | ÷ | 9 | × | a | ÷ | 100 | ) |
去掉方程右边的括号:
| 方程右边 = | 21600 | × | 1 | + | 21600 | × | 20 | ÷ | 9 | × | a | ÷ | 100 |
方程化为:
| | 36000 | + | 744 | a | + | 96 25 | a | a | = | 21600 | + | 480 | a |
本方程没有实数解!
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