(急速)解下列不等式组:1.{3x+1>-2,3x+1<7 2.{2x+3>x+2,3x>4x+23.{2x+3>0,x-2(x-1)>1,2x<43.2x+1≤x+5<3x+4

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(急速)解下列不等式组:1.{3x+1>-2,3x+1<72.{2x+3>x+2,3x>4x+23.{2x+3>0,x-2(x-1)>1,2x<43.2x+1≤x+5<3x+4(急速)解下列不等式组:

(急速)解下列不等式组:1.{3x+1>-2,3x+1<7 2.{2x+3>x+2,3x>4x+23.{2x+3>0,x-2(x-1)>1,2x<43.2x+1≤x+5<3x+4
(急速)解下列不等式组:1.{3x+1>-2,3x+1<7 2.{2x+3>x+2,3x>4x+2
3.{2x+3>0,x-2(x-1)>1,2x<4
3.2x+1≤x+5<3x+4

(急速)解下列不等式组:1.{3x+1>-2,3x+1<7 2.{2x+3>x+2,3x>4x+23.{2x+3>0,x-2(x-1)>1,2x<43.2x+1≤x+5<3x+4
1)3x+1>-2,①
3x+1<7 ②
由①得:x>-1,由②得:x<2
所以-1<x<2
2)2x+3>x+2,①
3x>4x+2 ②
由①得:x>-1,由②得:x<2
所以-1<x<2
3)2x+3>0,①
x-2(x-1)>1 ②
2x<4 ③
由①得:x>-3/2,由②得:x<1,由③得X<2
所以--3/2<x<1
4)2x+1≤x+5<3x+4
即2x+1≤x+5,①
x+5<3x+4 ②
由①得:x<4,由②得:x>1/2
所以1/2<x<4