1)x2-9x+8=0 (2)x2+6x-27=0 (3)x2-2x-80=0 (4)x2+10x-200=0
(5)x2-20x+96=0 (6)x2+23x+76=0 (7)x2-25x+154=0 (8)x2-12x-108=0
(9)x2+4x-252=0 (10)x2-11x-102=0 (11)x2+15x-54=0 (12)x2+11x+18=0
(13)x2-9x+20=0 (14)x2+19x+90=0 (15)x2-25x+156=0 (16)x2-22x+57=0
(17)x2-5x-176=0 (18)x2-26x+133=0 (19)x2+10x-11=0 (20)x2-3x-304=0
(21)x2+13x-140=0 (22)x2+13x-48=0 (23)x2+5x-176=0 (24)x23(2x一4) 9解方程+28x+171=0
(25)x2+14x+45=0 (26)x2-9x-136=0 (27)x2-15x-76=0 (28)x2+23x+126=0
(29)x2+9x-70=0 (30)x2-1x-56=0 (31)x2+7x-60=0 (32)x2+10x-39=0
(33)x2+19x+34=0 (34)x2-6x-160=0 (35)x2-6x-55=0 (36)x2-7x-144=0
(37)x2+20x+51=0 (38)x2-9x+14=0 (39)x2-29x+208=0 (40)x2+19x-20=0
(41)x2-13x-48=0 (42)x2+10x+24=0 (43)x2+28x+180=0 (44)x2-8x-209=0
(45)x2+23x+90=0 (46)x2+7x+6=0 (47)x2+16x+28=0 (48)x2+5x-50=0
(49)x2+13x-14=0 (50)x2-23x+102=0 (51)x2+5x-176=0 (52)x2-8x-20=0
(53)x2-16x+39=0 (54)x2+32x+240=0 (55)x2+34x+288=0 (56)x2+22x+105=0
(57)x2+19x-20=0 (58)x2-7x+6=0 (59)x2+4x-221=0 (60)x2+6x-91=0
3x²-1=0 X²+12X+36=24 X²-4X+1=8 4(6X-7)²-9=0 X²+X-1=0
X²+1/6X-1/3=0 3x²-5x=2 x²+8x=9 x²+12x-15=0 x²-9x+8=0
x²+6x-27=0 x²-2x-80=0 x²+10x-200=0 x²-20x+96=0 x²+23x+76=0
x²-25x+154=0 x²-12x-108=0 x²+4x-252=0 x²-11x-102=0 x²+15x-54=0
x²+11x+18=0 x²-9x+20=0 x²+19x+90=0 x²-25x+156=0 x²-22x+57=0
x²-5x-176=0 x²-26x+133=0 x²+10x-11=0 x²-3x-304=0 x²+13x-140=0
x²+13x-48=0 x²+5x-176=0 x²+28x+171=0 x²+14x+45=0 x²-9x-136=0
x²-15x-76=0 x²+23x+126=0 x²+9x-70=0 x²-1x-56=0 x²+7x-60=0
x²+10x-39=0 x²+19x+34=0 x²-6x-160=0 x²-6x-55=0 x²-7x-144=0
x²+20x+51=0 x²-9x+14=0 x²-29x+208=0 x²+19x-20=0 x²-13x-48=0
x²+10x+24=0 x²+28x+180=0 x²-8x-209=0 x²+23x+90=0 x²+7x+6=0
x²+16x+28=0 x²+5x-50=0 x²-23x+102=0 x²+5x-176=0 x²-8x-20=0
x²-16x+39=0 x²+32x+240=0 x²+34x+288=0 x²+22x+105=0 x²+19x-20=0
x²-7x+6=0 x²+4x-221=0 x²+6x-91=0 x²+8x+12=0 x²+7x-120=0
x²-18x+17=0 x²+7x-170=0 x²+6x+8=0 x²+13x+12=0 x²+24x+119=0
x²+11x-42=0 x²+2x-289=0 x²+13x+30=0 x²-24x+140=0 x²+4x-60=0
x²+27x+170=0 x²+27x+152=0 x²-2x-99=0 x²+12x+11=0 x²+20x+19=0
直接开方法基础练习
1.方程x2=16的根是x1=______,x2=_______.
2.若x2=225,则x1=_____,x2=_______.
3.若x2-2x=0,则x1=________,x2=________.
4.若(x-2)2=0,则x1=________,x2=_______.
5.若9x2-25=0,则x1=________,x2=_______.
6.若-2x2+8=0,则x1=________,x2=________.
7.若x2+4=0,则此方程解的情况是________.
8.若2x2-7=0,则此方程的解的情况是_______.
9.若5x2=0,则方程解为__________.
10.由7,9两题总结方程ax2+c=0(a≠0)的解的情况是:当ac>0时_________;当ac=0时______________;当ac<0时__________________.
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