一元二次方程计算题及答案120道-查字典问答网
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  一元二次方程计算题及答案120道

  一元二次方程计算题及答案120道

1回答
2019-09-28 23:56
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黄俊峰

  6X²-7X+1=0

  6X²-7X=-1

  X²-﹙7/6﹚X+﹙7/12﹚²=-1/6﹢﹙7/12﹚²

  ﹙X-7/12﹚²=25/144

  ∴X-7/12=±5/12

  ∴X1=1,X2=1/6

  5X²-18=9X

  5X²-9X=18

  X²-1.8X=3.6

  ﹙X-0.9﹚²=4.41

  ∴X-.9=±2.1

  ∴X1=3,X2=-1.2

  4X²-3X=52

  解:X²-﹙3/4﹚X=13

  ﹙X-3/8﹚²=13

  ∴X-3/8=±29/8

  ∴X1=4,X2=-13/4

  5X²=4-2X

  5X²+2X=4

  X²+0.2X=0.8

  ﹙X+0.1﹚²=0.81

  X+0.1=±0.9

  X1=-1,X2=0.8就这么几道,最好去百度搜索,那多1)x^2-9x+8=0答案:x1=8x2=1

  (2)x^2+6x-27=0答案:x1=3x2=-9

  (3)x^2-2x-80=0答案:x1=-8x2=10

  (4)x^2+10x-200=0答案:x1=-20x2=10

  (5)x^2-20x+96=0答案:x1=12x2=8

  (6)x^2+23x+76=0答案:x1=-19x2=-4

  (7)x^2-25x+154=0答案:x1=14x2=11

  (8)x^2-12x-108=0答案:x1=-6x2=18

  (9)x^2+4x-252=0答案:x1=14x2=-18

  (10)x^2-11x-102=0答案:x1=17x2=-6

  (11)x^2+15x-54=0答案:x1=-18x2=3

  (12)x^2+11x+18=0答案:x1=-2x2=-9

  (13)x^2-9x+20=0答案:x1=4x2=5

  (14)x^2+19x+90=0答案:x1=-10x2=-9

  (15)x^2-25x+156=0答案:x1=13x2=12

  (16)x^2-22x+57=0答案:x1=3x2=19

  (17)x^2-5x-176=0答案:x1=16x2=-11

  (18)x^2-26x+133=0答案:x1=7x2=19

  (19)x^2+10x-11=0答案:x1=-11x2=1

  (20)x^2-3x-304=0答案:x1=-16x2=19

  (21)x^2+13x-140=0答案:x1=7x2=-20

  (22)x^2+13x-48=0答案:x1=3x2=-16

  (23)x^2+5x-176=0答案:x1=-16x2=11

  (24)x^2+28x+171=0答案:x1=-9x2=-19

  (25)x^2+14x+45=0答案:x1=-9x2=-5

  (26)x^2-9x-136=0答案:x1=-8x2=17

  (27)x^2-15x-76=0答案:x1=19x2=-4

  (28)x^2+23x+126=0答案:x1=-9x2=-14

  (29)x^2+9x-70=0答案:x1=-14x2=5

  (30)x^2-1x-56=0答案:x1=8x2=-7

  (31)x^2+7x-60=0答案:x1=5x2=-12

  (32)x^2+10x-39=0答案:x1=-13x2=3

  (33)x^2+19x+34=0答案:x1=-17x2=-2

  (34)x^2-6x-160=0答案:x1=16x2=-10

  (35)x^2-6x-55=0答案:x1=11x2=-5

  (36)x^2-7x-144=0答案:x1=-9x2=16

  (37)x^2+20x+51=0答案:x1=-3x2=-17

  (38)x^2-9x+14=0答案:x1=2x2=7

  (39)x^2-29x+208=0答案:x1=16x2=13

  (40)x^2+19x-20=0答案:x1=-20x2=1

  (41)x^2-13x-48=0答案:x1=16x2=-3

  (42)x^2+10x+24=0答案:x1=-6x2=-4

  (43)x^2+28x+180=0答案:x1=-10x2=-18

  (44)x^2-8x-209=0答案:x1=-11x2=19

  (45)x^2+23x+90=0答案:x1=-18x2=-5

  (46)x^2+7x+6=0答案:x1=-6x2=-1

  (47)x^2+16x+28=0答案:x1=-14x2=-2

  (48)x^2+5x-50=0答案:x1=-10x2=5

  (49)x^2+13x-14=0答案:x1=1x2=-14

  (50)x^2-23x+102=0答案:x1=17x2=6

  (51)x^2+5x-176=0答案:x1=-16x2=11

  (52)x^2-8x-20=0答案:x1=-2x2=10

  (53)x^2-16x+39=0答案:x1=3x2=13

  (54)x^2+32x+240=0答案:x1=-20x2=-12

  (55)x^2+34x+288=0答案:x1=-18x2=-16

  (56)x^2+22x+105=0答案:x1=-7x2=-15

  (57)x^2+19x-20=0答案:x1=-20x2=1

  (58)x^2-7x+6=0答案:x1=6x2=1

  (59)x^2+4x-221=0答案:x1=13x2=-17

  (60)x^2+6x-91=0答案:x1=-13x2=7

  (61)x^2+8x+12=0答案:x1=-2x2=-6

  (62)x^2+7x-120=0答案:x1=

2019-09-28 23:57:36

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