Fujian mathematics college entrance examination questions should be solved immediately, analyzed immediately and adopted immediately.
The simplest and most effective way to replace one by one is to include x 2 in 3, but it is two to one, which does not conform to the one-to-one mapping relationship. According to the conditions, we can know that the corresponding value of one function is equal to the corresponding value of two functions, then we can know that this function does not contain constant terms.