解不等式及不等式组的练习题62957
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初二数学不等式
解下列不等式:
(1)x -17<-5; (2)x 2
1
->-3; (3)x 327-
>11; (4)351+x >35
4
--x .
(5)3x +1>4; (6)3-x <-1;
(7)2(x +1)<3x ; (8)3(x +2)≥5(x -2); (5)21+x ≥3
1
2-x ;; (6)532-x ≤413-x .
(7)
2
2
-x —1<x-1 (8) 2x-1≥3(x-1)
(9) 3x-2x <5 (10) x-6>2x
(11)
2x >3
x
-1 (12) 2x -7>5-2x
(13)
231x ->1-2x (14) x -2
1
(4x -1)≤2
(15)10-3(x +6) ≤1; (16)21
(x -3)<1-2x ;;
(17)x >4-
22+x ; (18)3
1
2-x -4<-24+x . (19) 21-x +1≥4
x
(20) 0.01x -1≤0.02x (21) 312-x -215-x ≤1 (22)34x +3≥1-3
2
x
(23) 5x -1<3(x+1) (24)
421x +-10
31x ->-51
(25)
757+x -2>2(x+1) (26) x+2x +3
x
>11
(27) 312+x ≤-25+x (28) 2
x -31
-x ≥1
(29) 2(-3+x)>3(x+2) (30)321x -≥6
34x
-
(31) 212-x <2
x (32) 25
-x +1>x -3 (33) 31x -2<1-51x (34) -5x +15
x ≤-1 (35) -2
x +2≤3x
-1 (36) 312+x -62x ->21-x -1
初二数学不等式组
解下列不等式组:
(1)⎩
⎨⎧≥-<-;112,
22x x (2)⎩⎨⎧<-->+;31,123x x
(3)⎩⎨
⎧>->+;03,012x x (4)⎩⎨⎧<+≤-.
514,
02x x
(5)⎩⎨⎧<->+;131,1-
95x x (6)⎪
⎩⎪⎨⎧->-≥-.12
2,32x
x x
(7)⎩⎨⎧-<-+>-;
421211,
1582x x x x (8)⎩⎨⎧->--<+;31052,932x x x x
(9)⎪⎩⎪⎨⎧->-+<-;21
5123),12(334x x x x (10)⎪⎩⎪⎨⎧<++-<-;13
12),2(34x x x x
(11)
312-x -2
1
5+x ≤1 (12) 2x-7<3(x -1) 5x-1<3(x+1) 34x +3≥1-3
2x
(13) 5x-2<3(x+1) (14) 3x-2<x+1
21x -1 ≥7-2
3x
x+5>4x+1
(15) x+3<5 (16) 2
x
+1<2(x -1) 3x-1>8 3
x >52
+x
(17) x-1>2x (18) 2x+5<3(x+2)
2x
+3<-3 21-x <3
x
(19) 0.2x >0.3x+1 (20) x-
21≤41
0.5x-1<0.2 3x +2
x
>-1
(21) 1+2x >3+x (22) 2-x ≤-1 5x ≤4x -1 3<x -1
(23) 3(x -1)<4x -2 (24) 21+32x ≤-2x +3
5 -5
x >21
+x 3(x -1)<x -5
(25) 2
1
(x+3)<2 (26) x -3(x -2)≥4 22+x >33+x 3
21x
+>x -1
(27) -5<2x+1<6 (28)-1<1-51x <5
3
(29) -54
x <1 (30) 5x+1≥3(x+1) 212-x <-2x+2
5
21-x >312-x
(31) ⎩⎨⎧-<-≤-.
13112,
123x x x (32)
⎪⎩⎪
⎨⎧<+<+;432
3,533x x
(33) ⎪⎪⎩⎪⎪⎨⎧>-->-;232
,2
12x x x (34)
⎩⎨
⎧>->+0
21,042x x .
(35)⎩⎨⎧≥->+424,
532x x (36)
⎩⎨
⎧->--≥+;
62,
513x x
(37)
⎩⎨⎧+<+->+7859321234x x x
x (38)⎩⎨⎧+>+-≥8
)2(33
1
4x x x x
(39)⎪⎩⎪
⎨
⎧≤--->-4
)2(325312x x x x (40)⎪⎩
⎪⎨⎧≥+--<--x x x x 323
8)1(31
(41)⎪⎩
⎪⎨
⎧<-+≤-012
)1(31x
x x (42)
⎪⎩
⎪⎨
⎧<--≤-03
8
32
1x x x
(43)⎪⎩
⎪
⎨⎧>++-≤0
1232
x x x (44)⎪⎩⎪⎨⎧+≥+<-4)2(3121x x x