初中初一数学解不等式①m-m-1/2≥2-m+2/5②2x<1-x≤x+5③ {5-7x≥2x-4 {1-3/4(x-1)<0.5要有列式过程,辛苦大家了!
2019-06-02
初中初一数学解不等式
①m-m-1/2≥2-m+2/5
②2x<1-x≤x+5
③ {5-7x≥2x-4
{1-3/4(x-1)<0.5要有列式过程,辛苦大家了!
优质解答
1:
-1/2≥2-m+2/5
m≥29/10
2:
{2x<1-x
{1-x≤x+5 ;
{ x < 1/3
{x≤-2 取交集得:x≤-2 < 1/3
3;
{x≤1
{x>-1/3 取交集得:-1/3<x≤1
1:
-1/2≥2-m+2/5
m≥29/10
2:
{2x<1-x
{1-x≤x+5 ;
{ x < 1/3
{x≤-2 取交集得:x≤-2 < 1/3
3;
{x≤1
{x>-1/3 取交集得:-1/3<x≤1