一元二次方程习题100道.doc

(2)x2+6x-27=0 答案：x1=3 x2=-9(3)x2-2x-80=0 答案：x1=-8 x2=10(4)x2+10x-200=0 答案：x1=-20 x2=10(5)x2-20x+96=0 答案：x1=12 x2=8(6)x2+23x+76=0 答案：x1=-19 x2=-4(7)x2-25x+154=0 答案：x1=14 x2=11(8)x2-12x-108=0 答案：x1=-6 x2=18(9)x2+4x-252=0 答案：x1=14 x2=-18(10)x2-11x-102=0 答案：x1=17 x2=-6(11)x2+15x-54=0 答案：x1=-18 x2=3(12)x2+11x+18=0 答案：x1=-2 x2=-9(13)x2-9x+20=0 答案：x1=4 x2=5(14)x2+19x+90=0 答案：x1=-10 x2=-9(15)x2-25x+156=0 答案：x1=13 x2=12(16)x2-22x+57=0 答案：x1=3 x2=19(17)x2-5x-176=0 答案：x1=16 x2=-11(18)x2-26x+133=0 答案：x1=7 x2=19(19)x2+10x-11=0 答案：x1=-11 x2=1(20)x2-3x-304=0 答案：x1=-16 x2=19(21)x2+13x-140=0 答案：x1=7 x2=-20(22)x2+13x-48=0 答案：x1=3 x2=-16(23)x2+5x-176=0 答案：x1=-16 x2=11(24)x2+28x+171=0 答案：x1=-9 x2=-19(25)x2+14x+45=0 答案：x1=-9 x2=-5(26)x2-9x-136=0 答案：x1=-8 x2=17(27)x2-15x-76=0 答案：x1=19 x2=-4(28)x2+23x+126=0 答案：x1=-9 x2=-14(29)x2+9x-70=0 答案：x1=-14 x2=5(30)x2-1x-56=0 答案：x1=8 x2=-7(31)x2+7x-60=0 答案：x1=5 x2=-12(32)x2+10x-39=0 答案：x1=-13 x2=3(33)x2+19x+34=0 答案：x1=-17 x2=-2(34)x2-6x-160=0 答案：x1=16 x2=-10(35)x2-6x-55=0 答案：x1=11 x2=-5(36)x2-7x-144=0 答案：x1=-9 x2=16(37)x2+20x+51=0 答案：x1=-3 x2=-17(38)x2-9x+14=0 答案：x1=2 x2=7(39)x2-29x+208=0 答案：x1=16 x2=13(40)x2+19x-20=0 答案：x1=-20 x2=1(41)x2-13x-48=0 答案：x1=16 x2=-3(42)x2+10x+24=0 答案：x1=-6 x2=-4(43)x2+28x+180=0 答案：x1=-10 x2=-18(44)x2-8x-209=0 答案：x1=-11 x2=19(45)x2+23x+90=0 答案：x1=-18 x2=-5(46)x2+7x+6=0 答案：x1=-6 x2=-1(47)x2+16x+28=0 答案：x1=-14 x2=-2(48)x2+5x-50=0 答案：x1=-10 x2=5(49)x2+13x-14=0 答案：x1=1 x2=-14(50)x2-23x+102=0 答案：x1=17 x2=6(51)x2+5x-176=0 答案：x1=-16 x2=11(52)x2-8x-20=0 答案：x1=-2 x2=10(53)x2-16x+39=0 答案：x1=3 x2=13(54)x2+32x+240=0 答案：x1=-20 x2=-12(55)x2+34x+288=0 答案：x1=-18 x2=-16(56)x2+22x+105=0 答案：x1=-7 x2=-15(57)x2+19x-20=0 答案：x1=-20 x2=1(58)x2-7x+6=0 答案：x1=6 x2=1(59)x2+4x-221=0 答案：x1=13 x2=-17(60)x2+6x-91=0 答案：x1=-13 x2=7(61)x2+8x+12=0 答案：x1=-2 x2=-6(62)x2+7x-120=0 答案：x1=-15 x2=8(63)x2-18x+17=0 答案：x1=17 x2=1(64)x2+7x-170=0 答案：x1=-17 x2=10(65)x2+6x+8=0 答案：x1=-4 x2=-2(66)x2+13x+12=0 答案：x1=-1 x2=-12(67)x2+24x+119=0 答案：x1=-7 x2=-17(68)x2+11x-42=0 答案：x1=3 x2=-14(69)x20x-289=0 答案：x1=17 x2=-17(70)x2+13x+30=0 答案：x1=-3 x2=-10(71)x2-24x+140=0 答案：x1=14 x2=10(72)x2+4x-60=0 答案：x1=-10 x2=6(73)x2+27x+170=0 答案：x1=-10 x2=-17(74)x2+27x+152=0 答案：x1=-19 x2=-8(75)x2-2x-99=0 答案：x1=11 x2=-9(76)x2+12x+11=0 答案：x1=-11 x2=-1(77)x2+17x+70=0 答案：x1=-10 x2=-7(78)x2+20x+19=0 答案：x1=-19 x2=-1(79)x2-2x-168=0 答案：x1=-12 x2=14(80)x2-13x+30=0 答案：x1=3 x2=10(81)x2-10x-119=0 答案：x1=17 x2=-7(82)x2+16x-17=0 答案：x1=1 x2=-17(83)x2-1x-20=0 答案：x1=5 x2=-4(84)x2-2x-288=0 答案：x1=18 x2=-16(85)x2-20x+64=0 答案：x1=16 x2=4(86)x2+22x+105=0 答案：x1=-7 x2=-15(87)x2+13x+12=0 答案：x1=-1 x2=-12(88)x2-4x-285=0 答案：x1=19 x2=-15(89)x2+26x+133=0 答案：x1=-19 x2=-7(90)x2-17x+16=0 答案：x1=1 x2=16(91)x2+3x-4=0 答案：x1=1 x2=-4(92)x2-14x+48=0 答案：x1=6 x2=8(93)x2-12x-133=0 答案：x1=19 x2=-7(94)x2+5x+4=0 答案：x1=-1 x2=-4(95)x2+6x-91=0 答案：x1=7 x2=-13(96)x2+3x-4=0 答案：x1=-4 x2=1(97)x2-13x+12=0 答案：x1=12 x2=1(98)x2+7x-44=0 答案：x1=-11 x2=4(99)x2-6x-7=0 答案：x1=-1 x2=7(100)x2-9x-90=0 答案：x1=15 x2=-6(101)x2+17x+72=0 答案：x1=-8 x2=-9(102)x2+13x-14=0 答案：x1=-14 x2=1(103)x2+9x-36=0 答案：x1=-12 x2=3(104)x2-9x-90=0 答案：x1=-6 x2=15(105)x2+14x+13=0 答案：x1=-1 x2=-13(106)x2-16x+63=0 答案：x1=7 x2=9(107)x2-15x+44=0 答案：x1=4 x2=11(108)x2+2x-168=0 答案：x1=-14 x2=12(109)x2-6x-216=0 答案：x1=-12 x2=18(110)x2-6x-55=0 答案：x1=11 x2=-5(111)x2+18x+32=0 答案：x1=-2 x2=-16（1） （2） （3） （4） （5）； （6）； （7） （8） （9） （10） （11）；（12）（13） （14）； （15）（16） （17） （18） (42)x2+4x+2=0 (43)3x2-6x+1=0;(44)4x2-16x+17=0(45)3x2+4x+