一元二次不等式解法练习题目.docx

.不等式解法(1).2x 25x120(12).4n 2+4n15 0(2).3x 25x20(13).6a 2+a350(3).6x 213x+5 0(14).-x2-2x+8 0(4).-7x2+19x+60(15).x2+3x-10 0(5).12x213x+30(16)5x28x13 0(6).4x2+24x+27 0(17)4x2+15x+9 0(7).5x2+6x-8 0(8).2x2+3x+1 0(19)6y2+19y+100(9).2y2+y6 0(20)209y20y2 0(10).6x 213x+60(21).x 2-x-20 0(11).3a 27a6 0(22).x 2+x-6 0.(31).-2x2-5x+3 0(40).x 2+6x-7 0(32).6x 2+4x-2 0(41).-x2+8x-7 0(33).x 2-2x-3 0(42).x 2+8x+70(34).-x2-6x-8 0(43).-x2+5x-6 0(35).x 2-x-12 0(44).x 2-5x-6 0(36).x 2-7x+10 0(45).x 2+5x-6 0(37).6x 2+x+20(46).x 2+5x+60(38).4x 2+4x-3 0(47).m 2+4m-12 0(39).x 2-6x-7 0(48).6x 2-5x-25 0.