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若你看到某个分数,至少有一个变量在分子或分母位置,则这个数就是“有理表达式”。有理方程就是含有至少一个有理表达式的等式。解有理方程的方法和其他任意方程的方法一样,就是通过化简,使得变量移到等号一边来解。不过有两种特殊方法可以帮你快速解有理方程式。
步骤
小提示
- 解出变量以后,代入原方程验证。如果你让两边值相等,即两边化简后得到1 = 1,则你算得对。
- 注意,你可以把任意的多项式写成有理表达式,只要认为它的分母是 "1" ,即可。 x+3和 (x+3)/1的值是一样的,但是后者才是有理表达式,因为它是分式形式的。
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