第一步就错了

来源: 于 2018-08-09 16:25:41 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次
不能用variable 做除数 1， 如果 x有一个解是0，则all undefined. 2, 如果x所有解都是real numbers, then, one solution is missing. 3, if x is not real numbers, divide a complex number is too much work to do, not the regularorder of operations. So, you can't divide the variable for solutions