1、1初二数学不等式解下列不等式:(1)x175; (2) 3;x1(3) 11; (4) x275x4(5)3x14; (6)3x1;(7)2(x1)3x ; (8)3(x 2)5(x2) ;(5) ; (6) 21x3532x41(7) 1x-1 (8) 2x-13(x-1)2x(9) 3x-2x5 (10) x-62x2(11) 1 (12) 2x752x2x3(13) 12x (14) x (4x1)223x 21(15)103(x6) 1; (16) ( x3)12x;21(17)x4 ; (18) 4 .2312x2x(19) 1 (20) 0.01x10.02x21x4(21) 1
2、(22) x31 x312x5342(23) 5x13(x+1) (24) 421x0513(25) 22(x+1) (26) x+ + 1175x 2x3(27) (28) 1312x52x31(29) 2(3+x)3(x+2) (30) 321x64(31) (32) +1x321x 25(33) x21 x (34) + 1355x(35) +2 1 (36) 12x3312x62x4初二数学不等式组解下列不等式组:(1) (2);12,x ;31,x(3) (4) ;0,12x .51,02x(5) (6 );13,9x .12,3x(7) (8);421,58xx ;31052,9x
3、x5(9) (10);2153),(4xx ;132),(4x(11) 1 (12) 2x-73(x1) 312x55x-13(x+1) +31 34x2(13) 5x-23(x+1) (14) 3x-2x+1x -1 7 x+54x+1213(15) x+35 (16) +12(x1) 2x3x-18 35(17) x-12x (18) 2x+53(x+2) +33 2x 21x36(19) 0.2x0.3x+1 (20) x- 2140.5x-10.2 + 13x(21) 1+2x3+x (22) 2x15x4x1 3x1(23) 3(x1)4x2 (24) + +213x5 3(x1)x55x1(25) (x+3)2 (26) x3(x2)4 1 x1x332(27) 52x+16 (28)11 x5137(29) x1 (30) 5x+13(x+1)542x+ 2 21x3(31) (32) .1312,x;432,5x(33) (34) ;23,1x021,4x(35) (36) 42,53x ;62,513x8(37) (38)785932134xx 8)2(314xx(39) (40)4)2(325312xxx xxxx328)1(31(41) (42)012)1(31xxx 038321xxx(43) (44)0123xx 4)2(312xx