怎么这个解不等式

(1-m)^2-4m^2<0
(1-m)^2-(2m)^2<0
(1-m+2m)(1-m-2m)<0
(1+m)(1-3m)<0
(m+1)(3m-1)>0
m>1/3或m<-1

(m+1)(3m-1)>0
两数之积大于0，则都大于0或都小于0
则m+1>0且3m-1>0,得m>1/3
或m+1<0且3m-1<0,得m<-1

（1-m）²-4m²＜0
1-2m+m²-4m²＜0
-3m²+2m+1＜0
3m²-2m-1＞0
（3m+1）(m-1)＞0
m＜-1/3或m＞1

(1-m)平方-4m平方<0
(m-1)平方-4m平方<0
展开因式合并
3m平方+2m-1＞0
由抛物线得范围在两根之外
令3m平方+2m-1=0
得m=-1或m=1/3
所以m<-1或m＞1/3

(1-m)^2-4m^2<0
(1-m+2m)(1-m-2m)<0
1+m<0 m<-1
1-3m<0 m＞1/3

1-2m+m^2-4m^2<0
-3m^2 -2m+1<0
3m^2+2m-1>0
(m+1)(3m-1)>0
m>1/3 huo m<-1

(1-m)^2-4m^2＜0
m^2-2m+1-4m^2＜0
-3m^2-2m+1＜0
0＜3m^2+2m-1
0＜(m+1)(3m-1)
m＜-1或m＞1/3 ^ 2 表示 平方