-2<1-2m<2 结果算到 3/2<m<-1/2 怎么处理?
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![-2<1-2m<2 结果算到 3/2<m<-1/2 怎么处理?](/uploads/image/z/6920292-12-2.jpg?t=-2%EF%BC%9C1-2m%EF%BC%9C2+%E7%BB%93%E6%9E%9C%E7%AE%97%E5%88%B0+3%2F2%EF%BC%9Cm%EF%BC%9C-1%2F2+%E6%80%8E%E4%B9%88%E5%A4%84%E7%90%86%3F)
-2<1-2m<2 结果算到 3/2<m<-1/2 怎么处理?
-2<1-2m<2 结果算到 3/2<m<-1/2 怎么处理?
-2<1-2m<2 结果算到 3/2<m<-1/2 怎么处理?
-2<1-2m<2
-3<-2m<1
两边同乘-1,不等式变为3>2m>-1
同除2
变为3/2>m>-1/2
得证.
不等式两边同时乘以一个负数,不等号改变方向。