初一数学下册练习题解不等式 5
{2x-1大与0{-3x-1大于3{3(x-10+13大于5x-2(5-x){x-1小于3{2x+1大于3{5-(2x+1)小于3-6x...
{2x-1大与0 {-3x-1大于3 {3(x-10+13大于5x-2(5-x) {x-1小于3 {2x+1大于3 {5-(2x+1)小于3-6x
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1, 2x-1>0
2x>1
x>1/2
2,{-3x-1>3
-3x>3+1
-3x>4
x<-4/3
3, 3(x-10)+13>5x-2(5-x)
3x-30+13>5x-10+2x
3x-5x-2x>-10+30-13
(3-5-2)x>7
-4x>7
x<-7/4
4, {x-1<3
x<3+1
x<4
5, 2x+1>3
2x>3-1
2x>2
x>1
6, {5-(2x+1)<3-6x
5-2x-1<3-6x
4-2x<3-6x
6x-2x<3-4
(6-2)x<-1
4x<-1
x<-1/4
2x>1
x>1/2
2,{-3x-1>3
-3x>3+1
-3x>4
x<-4/3
3, 3(x-10)+13>5x-2(5-x)
3x-30+13>5x-10+2x
3x-5x-2x>-10+30-13
(3-5-2)x>7
-4x>7
x<-7/4
4, {x-1<3
x<3+1
x<4
5, 2x+1>3
2x>3-1
2x>2
x>1
6, {5-(2x+1)<3-6x
5-2x-1<3-6x
4-2x<3-6x
6x-2x<3-4
(6-2)x<-1
4x<-1
x<-1/4
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