解不等式及不等式組的練習(xí)題

1、初二數(shù)學(xué)不等式(9)3x-2x v 5(10)x-6 > 2x解下列不等式:(1) x 17V 5;(2) -X>- 3；2,、21c 4 c(3) 7 x>ii；(4 ) -x 3> -x 3.(5) 3x+1>4;355(6) 3 x< 1;(7) 2 (x+ 1) <3x；(8) 3 (x+2) > 5 (x 2 );(5 )(6 )2x 3 3x 1&54/、 x 2(7 )- 1 < x-1(8)2x-1 >3(x-1)(11)X X V 1 2 3(12) 2X 7V52X1 3x 1(13) VI 2X (14)

2、 x (4X1)八2(15) 10 3X+6)八 1)(16)Ml(X3) A1 2X:X 1 X(19) + - V I (2。)2 4(21)(22)S X+ 3 V 1 gx3 3(23)5X 1A3X+1) (24)1 2x I 1 3x4 1。(25)7x 5-2>2(x+1)7(26) x+_x +2 > 112 3(27)2x 1x 5(28)xx 1 >1 1322(29) 2(3+x) > 3(x+2)(30)1 2x4 3x36(31)2x 1 x2 < 2(32)x 52+1 >x-3(33)-x-2<1-x35(34)一+511

3、5(35)-x+2w x 123(36)2x 132 x x 16121解下列不等式組:(1)x 2 2,2x 1 1;(3)2x 1 0, 3x0;(5)5x 9- 1,1 3x 1;2x 8 5x 1,11 2x 21 4x;初二數(shù)學(xué)不等式組(2)(4)(6)3x 21,1 x 3;2x 0,4x 1 5.2x 3x,1.2x 3 9 x, 2x 5 10 3x;(8 )(9)4x 33x i23(2x 1),12x;(10)x 42x 133(x 2),1 x;(11)i2x 1 5x 132<3(x+1)(12)2x-7<3(x4x c 一+3> 131)2x萬(wàn)23(

4、13)5x-2<3(x+1)(14)3x-2v x+1、1-x -1>7-3xx+5'>4x+122<5>8(16)x+1 <2(x 1)2x x 2(18)2x+5<3(x+2)丁丁(17) x-1>2xx , + +3v 32(19)r +1(20)x-(21) j+2x >3+x(22)(23)/ 3(x - 1) <4x-2(24)(25)41<x- 11 +22 33(x1) vx 5<2(26)-3(x - 2) > 43>x13(27)-5<2x+1<6(28)x< (29)-4x<15(30)5x+1>3(x+1)(31)(33)(35)2x 13x12x<-2x+522x 1>312,2x 3 5,4x 2 43x1.(32)x,2；(34)(36)3x 35,0,3x 15,2x 6;(39)(41)(43)9x58x 7422-x1 -x33(37)(38)3(x 2) x x 1 4 Yx 3 ( x2)