作业帮化简(7-x)(7+x)/(x-7)(x-1)
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/15 17:58:18
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化简(7-x)(7+x)/(x-7)(x-1)
化简(7-x)(7+x)/(x-7)(x-1)
化简(7-x)(7+x)/(x-7)(x-1)
=-(7+x)/(x-1)
=(7+x)/(1-x)
添加一个负号后变成-(x-7)(7+x)/(x-7)(x-1)，约调(x-7)就好了，得-(7+x)/(x-1) ,再写写好就是(7+x)/(1-x)
=-(X-7)(X+7)/(X-7)(X-1)
=-(X+7)/(X-1)
sxmcody 正解 冰玲妹妹你多大
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