[人教版九年级上册数学一元二次方程应用题]解1）：单价定为每千克55元时，销售单价上涨了55-50=5（元），月销售量就减少5*10=50（千克），这时是销售量是500-50=450（千克），每千克的利润是55-40=15（元） 月销售利润是15*450=6750（元） 2）：当销售单...+阅读

(1)x^2-9x+8=0 答案：x1=8 x2=1

(2)x^2+6x-27=0 答案：x1=3 x2=-9

(3)x^2-2x-80=0 答案：x1=-8 x2=10

(4)x^2+10x-200=0 答案：x1=-20 x2=10

(5)x^2-20x+96=0 答案：x1=12 x2=8

(6)x^2+23x+76=0 答案：x1=-19 x2=-4

(7)x^2-25x+154=0 答案：x1=14 x2=11

(8)x^2-12x-108=0 答案：x1=-6 x2=18

(9)x^2+4x-252=0 答案：x1=14 x2=-18

(10)x^2-11x-102=0 答案：x1=17 x2=-6

(11)x^2+15x-54=0 答案：x1=-18 x2=3

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

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