题目

用适当的方法解下列方程：(1)(6x－1)2＝25； (2)x2－2x＝2x－1； (3)x2－x＝2； (4)x(x－7)＝8(7－x)． 答案：【答案】(1) x1＝1，x2＝－；(2) x1＝2＋，x2＝2－；(3)x1＝，x2＝；(4) x1＝7，x2＝－8.【解析】试题分析：(1)、两边直接开平方得出方程的解；(2)、首先将方程的左边转化为含有x的项，右边保留常数项，然后利用配方法求出方程的解；(3)、首先将方程转化为一般式，然后利用公式法得出方程的解；(4)、首先16．16．A．In a school．B．In a factory．C．On a farm．17．A．In the morning．B．In the afternoon．C．At night．18．A．Because Tom was her old friend．B．Because she wanted to buy Tom's ticket．C．Because Tom found her lost ticket．19．A．He was the woman's grandfather．B．He was an office worker of the station．C．He was the owner of a big factory．20．A．He wanted to give him a job．B．He wanted to lend him some money．C．He wanted to give him a ticket．