总述:本次共解1题。其中
☆方程1题
〖 1/1方程〗
作业:求方程 (98-180*x)(294-270*x)(441-270*x)-196*196*(98-180*x)-98*98*(441-270*x) = 0 的解.
题型:方程
解:原方程: | ( | 98 | − | 180 | x | ) | ( | 294 | − | 270 | x | ) | ( | 441 | − | 270 | x | ) | − | 196 | × | 196 | ( | 98 | − | 180 | x | ) | − | 98 | × | 98 | ( | 441 | − | 270 | x | ) | = | 0 |
方程左边 = | ( | 98 | − | 180 | x | ) | ( | 294 | − | 270 | x | ) | ( | 441 | − | 270 | x | ) | − | 38416 | ( | 98 | − | 180 | x | ) | − | 9604 | ( | 441 | − | 270 | x | ) |
方程化为:
| ( | 98 | − | 180 | x | ) | ( | 294 | − | 270 | x | ) | ( | 441 | − | 270 | x | ) | − | 38416 | ( | 98 | − | 180 | x | ) | − | 9604 | ( | 441 | − | 270 | x | ) | = | 0 |
去掉方程左边的括号:
方程左边 = | 98 | ( | 294 | − | 270 | x | ) | ( | 441 | − | 270 | x | ) | − | 180 | x | ( | 294 | − | 270 | x | ) | ( | 441 | − | 270 | x | ) | − | 38416 | ( | 98 | − | 180 | x | ) | − | 9604 | ( | 441 | − | 270 | x | ) |
= | 98 | × | 294 | ( | 441 | − | 270 | x | ) | − | 98 | × | 270 | x | ( | 441 | − | 270 | x | ) | − | 180 | x | ( | 294 | − | 270 | x | ) | ( | 441 | − | 270 | x | ) | − | 38416 |
= | 28812 | ( | 441 | − | 270 | x | ) | − | 26460 | x | ( | 441 | − | 270 | x | ) | − | 180 | x | ( | 294 | − | 270 | x | ) | ( | 441 | − | 270 | x | ) | − | 38416 | ( | 98 | − | 180 | x | ) | − | 9604 |
= | 28812 | × | 441 | − | 28812 | × | 270 | x | − | 26460 | x | ( | 441 | − | 270 | x | ) | − | 180 | x | ( | 294 | − | 270 | x | ) | ( | 441 | − | 270 | x | ) |
= | 12706092 | − | 7779240 | x | − | 26460 | x | ( | 441 | − | 270 | x | ) | − | 180 | x | ( | 294 | − | 270 | x | ) | ( | 441 | − | 270 | x | ) | − | 38416 | ( | 98 | − | 180 | x | ) |
= | 12706092 | − | 7779240 | x | − | 26460 | x | × | 441 | + | 26460 | x | × | 270 | x | − | 180 | x |
= | 12706092 | − | 7779240 | x | − | 11668860 | x | + | 7144200 | x | x | − | 180 | x | ( | 294 | − | 270 | x | ) | ( | 441 | − | 270 | x | ) |
= | 12706092 | − | 19448100 | x | + | 7144200 | x | x | − | 180 | x | ( | 294 | − | 270 | x | ) | ( | 441 | − | 270 | x | ) | − | 38416 | ( | 98 | − | 180 | x | ) |
= | 12706092 | − | 19448100 | x | + | 7144200 | x | x | − | 180 | x | × | 294 | ( | 441 | − | 270 | x | ) | + | 180 | x |
= | 12706092 | − | 19448100 | x | + | 7144200 | x | x | − | 52920 | x | ( | 441 | − | 270 | x | ) | + | 48600 | x | x |
= | 12706092 | − | 19448100 | x | + | 7144200 | x | x | − | 52920 | x | × | 441 | + | 52920 | x | × | 270 |
= | 12706092 | − | 19448100 | x | + | 7144200 | x | x | − | 23337720 | x | + | 14288400 | x | x | + | 48600 |
= | 12706092 | − | 42785820 | x | + | 7144200 | x | x | + | 14288400 | x | x | + | 48600 | x | x |
= | 12706092 | − | 42785820 | x | + | 7144200 | x | x | + | 14288400 | x | x | + | 48600 | x | x |
= | 12706092 | − | 42785820 | x | + | 7144200 | x | x | + | 14288400 | x | x | + | 21432600 | x | x |
= | 12706092 | − | 42785820 | x | + | 7144200 | x | x | + | 14288400 | x | x | + | 21432600 | x | x |
= | 12706092 | − | 42785820 | x | + | 7144200 | x | x | + | 14288400 | x | x | + | 21432600 | x | x |
= | 8941324 | − | 35870940 | x | + | 7144200 | x | x | + | 14288400 | x | x | + | 21432600 | x | x |
= | 8941324 | − | 35870940 | x | + | 7144200 | x | x | + | 14288400 | x | x | + | 21432600 | x | x |
= | 8941324 | − | 35870940 | x | + | 7144200 | x | x | + | 14288400 | x | x | + | 21432600 | x | x |
= | 4705960 | − | 33277860 | x | + | 7144200 | x | x | + | 14288400 | x | x | + | 21432600 | x | x |
方程化为:
| 4705960 | − | 33277860 | x | + | 7144200 | x | x | + | 14288400 | x | x | + | 21432600 | x | x | = | 0 |
方程化为一般式后,用因式分解法化为:
( 270x - 49 )( 54x - 49 )( 45x - 98 )=0
由
270x - 49 = 0
54x - 49 = 0
45x - 98 = 0
得:
有 3个解。
解程的详细方法请参阅:《方程的解法》
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