总述:本次共解1题。其中
☆方程1题
〖 1/1方程〗
作业:求方程 (3500-50a)*240(1+a/50)+3000*(1-a/40)*360(1+a/30) = 1944000 的解.
题型:方程
解:原方程:| | ( | 3500 | − | 50 | a | ) | × | 240 | ( | 1 | + | a | ÷ | 50 | ) | + | 3000 | ( | 1 | − | a | ÷ | 40 | ) | × | 360 | ( | 1 | + | a | ÷ | 30 | ) | = | 1944000 |
| 方程左边 = | ( | 3500 | − | 50 | a | ) | × | 240 | ( | 1 | + | a | ÷ | 50 | ) | + | 1080000 | ( | 1 | − | a | ÷ | 40 | ) | ( | 1 | + | a | ÷ | 30 | ) |
方程化为:
| | ( | 3500 | − | 50 | a | ) | × | 240 | ( | 1 | + | a | ÷ | 50 | ) | + | 1080000 | ( | 1 | − | a | ÷ | 40 | ) | ( | 1 | + | a | ÷ | 30 | ) | = | 1944000 |
去掉方程左边的括号:
| 方程左边 = | 3500 | × | 240 | ( | 1 | + | a | ÷ | 50 | ) | − | 50 | a | × | 240 | ( | 1 | + | a | ÷ | 50 | ) | + | 1080000 | ( | 1 | − | a | ÷ | 40 | ) | ( | 1 | + | a | ÷ | 30 | ) |
| = | 840000 | ( | 1 | + | a | ÷ | 50 | ) | − | 12000 | a | ( | 1 | + | a | ÷ | 50 | ) | + | 1080000 | ( | 1 | − | a | ÷ | 40 | ) | ( | 1 | + | a | ÷ | 30 | ) |
| = | 840000 | × | 1 | + | 840000 | a | ÷ | 50 | − | 12000 | a | ( | 1 | + | a | ÷ | 50 | ) | + | 1080000 | ( | 1 | − | a | ÷ | 40 | ) | ( | 1 | + | a | ÷ | 30 | ) |
| = | 840000 | + | 16800 | a | − | 12000 | a | ( | 1 | + | a | ÷ | 50 | ) | + | 1080000 | ( | 1 | − | a | ÷ | 40 | ) | ( | 1 | + | a | ÷ | 30 | ) |
| = | 840000 | + | 16800 | a | − | 12000 | a | × | 1 | − | 12000 | a | a | ÷ | 50 | + | 1080000 | ( | 1 | − | a | ÷ | 40 | ) |
| = | 840000 | + | 16800 | a | − | 12000 | a | − | 240 | a | a | + | 1080000 | ( | 1 | − | a | ÷ | 40 | ) | ( | 1 | + | a | ÷ | 30 | ) |
| = | 840000 | + | 4800 | a | − | 240 | a | a | + | 1080000 | ( | 1 | − | a | ÷ | 40 | ) | ( | 1 | + | a | ÷ | 30 | ) |
| = | 840000 | + | 4800 | a | − | 240 | a | a | + | 1080000 | × | 1 | ( | 1 | + | a | ÷ | 30 | ) | − | 1080000 | a | ÷ | 40 |
| = | 840000 | + | 4800 | a | − | 240 | a | a | + | 1080000 | ( | 1 | + | a | ÷ | 30 | ) | − | 27000 | a | ( | 1 | + | a | ÷ | 30 | ) |
| = | 840000 | + | 4800 | a | − | 240 | a | a | + | 1080000 | × | 1 | + | 1080000 | a | ÷ | 30 | − | 27000 |
| = | 840000 | + | 4800 | a | − | 240 | a | a | + | 1080000 | + | 36000 | a | − | 27000 | a | ( | 1 | + | a | ÷ | 30 | ) |
| = | 1920000 | + | 40800 | a | − | 240 | a | a | − | 27000 | a | ( | 1 | + | a | ÷ | 30 | ) |
| = | 1920000 | + | 40800 | a | − | 240 | a | a | − | 27000 | a | × | 1 | − | 27000 | a | a |
| = | 1920000 | + | 40800 | a | − | 240 | a | a | − | 27000 | a | − | 900 | a | a |
| = | 1920000 | + | 13800 | a | − | 240 | a | a | − | 900 | a | a |
方程化为:
| | 1920000 | + | 13800 | a | − | 240 | a | a | − | 900 | a | a | = | 1944000 |
方程化为一般式后,有公因式:
( a - 10 )
由
a - 10 = 0
得:
不能由因式分解法得出的解:
a2≈2.105263 ,保留6位小数
有 2个解。
解程的详细方法请参阅:《方程的解法》
你的问题在这里没有得到解决?请到 热门难题 里面看看吧!