一元二次方程练习题含答案(解法20题题海111题)

1 经 典解法 20 题 （ 1） (3x+1)^2=7 （ 2） 9x^2-24x+16=11 (3) (x+3)(x-6)=-8 (4) 2x^2+3x=0 (5) 6x^2+5x-50=0 (选 学 ） (6)x^2-4x+4=0 （ 选 学 ） (7)（ x-2） ^2=4（ 2x+3） ^2 （ 8） y^2+2√2y-4=0 （ 9） （ x+1） ^2-3（ x+1)+2=0 （ 10） x^2+2ax-3a^2=0（ a 为常数） 2 (11)2x^2＋ 7x＝ 4． (12)x^2－ 1＝ 2 x （13） x^2 + 6x+5=0 (14) x ^2－ 4x+ 3=0 (15)7x^2 － 4x－ 3 =0 (16)x ^2－ 6x+9 =0 (17)x²+8x+16=9 (18)(x²-5)²=16 (19)x(x+2)=x(3-x)+1 (20) 6x^2+x-2=0 3 海量 111 题 1)x^2-9x+8=0 (2)x^2+6x-27=0 (3)x^2-2x-80=0 (4)x^2+10x-200=0 (5)x^2-20x+96=0 (6)x^2+23x+76=0 (7)x^2-25x+154=0 (8)x^2-12x-108=0 (9)x^2+4x-252=0 (10)x^2-11x-102=0 (11)x^2+15x-54=0 (12)x^2+11x+18=0 (13)x^2-9x+20=0 (14)x^2+19x+90=0 (15)x^2-25x+156=0 (16)x^2-22x+57=0 (17)x^2-5x-176=0 (18)x^2-26x+133=0 (19)x^2+10x-11=0 (20)x^2-3x-304=0 (21)x^2+13x-140=0 4 (22)x^2+13x-48=0 (23)x^2+5x-176=0 (24)x^2+28x+171=0 (25)x^2+14x+45=0 (26)x^2-9x-136=0 (27)x^2-15x-76=0 (28)x^2+23x+126=0 (29)x^2+9x-70=0 (30)x^2-1x-56=0 (31)x^2+7x-60=0 (32)x^2+10x-39=0 (33)x^2+19x+34=0 (34)x^2-6x-160=0 (35)x^2-6x-55=0 (36)x^2-7x-144=0 (37)x^2+20x+51=0 (38)x^2-9x+14=0 (39)x^2-29x+208=0 (40)x^2+19x-20=0 (41)x^2-13x-48=0 (42)x^2+10x+24=0 (43)x^2+28x+180=0 5 (44)x^2-8x-209=0 (45)x^2+23x+90=0 (46)x^2+7x+6=0 (47)x^2+16x+28=0 (48)x^2+5x-50=0 (49)x^2+13x-14=0 (50)x^2-23x+102=0 (51)x^2+5x-176=0 (52)x^2-8x-20=0 (53)x^2-16x+39=0 (54)x^2+32x+240=0 (55)x^2+34x+288=0 (56)x^2+22x+105=0 (57)x^2+19x-20=0 (58)x^2-7x+6=0 (59)x^2+4x-221=0 (60)x^2+6x-91=0 (61)x^2+8x+12=0 (62)x^2+7x-120=0 (63)x^2-18x+17=0 (64)x^2+7x-170=0 (65)x^2+6x+8=0 6 (66)x^2+13x+12=0 (67)x^2+24x+119=0 (68)x^2+11x-42=0 (69)x^20x-289=0 (70)x^2+13x+30=0 (71)x^2-24x+140=0 (72)x^2+4x-60=0 (73)x^2+27x+170=0 (74)x^2+27x+152=0 (75)x^2-2x-99=0 (76)x^2+12x+11=0 (77)x^2+17x+70=0 (78)x^2+20x+19=0 (79)x^2-2x-168=0 (80)x^2-13x+30=0 (81)x^2-10x-119=0...