一元二次方程练习题集.docx
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一元二次方程练习题集
一元二次方程练习题集
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(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(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
1x^2-6x+5=022.x^2+4x-5=033.4x^2-12x+5=04x^2+4x+4=052x^2-5x+2=0
6x^2+6x-7=07x^2+3x-4=08x^2+5x-6=09a^2-5a+6=010c^2+3c-4=0
112x^2+5x-3=012x^2-6x+8=013x^2-4x-5=014x^2-8x+15=0157x^2-8x+1=0
164x^2-4x-3=017x^2-6x+8=018x^2-2x-8=019x^2+2x-8=0204x^2-12x-7=0
3x²-1=0X²+12X+36=24X²-4X+1=84(6X-7)²-9=0X²+X-1=0
X²+1/6X-1/3=03x²-5x=2x²+8x=9x²+12x-15=0x²-9x+8=0
x²+6x-27=0x²-2x-80=0x²+10x-200=0x²-20x+96=0x²+23x+76=0
x²-25x+154=0x²-12x-108=0x²+4x-252=0x²-11x-102=0x²+15x-54=0
x²+11x+18=0x²-9x+20=0x²+19x+90=0x²-25x+156=0x²-22x+57=0
x²-5x-176=0x²-26x+133=0x²+10x-11=0x²-3x-304=0x²+13x-140=0
x²+13x-48=0x²+5x-176=0x²+28x+171=0x²+14x+45=0x²-9x-136=0
x²-15x-76=0x²+23x+126=0x²+9x-70=0x²-1x-56=0x²+7x-60=0
x²+10x-39=0x²+19x+34=0x²-6x-160=0x²-6x-55=0x²-7x-144=0
x²+20x+51=0x²-9x+14=0x²-29x+208=0x²+19x-20=0x²-13x-48=0
x²+10x+24=0x²+28x+180=0x²-8x-209=0x²+23x+90=0x²+7x+6=0
x²+16x+28=0x²+5x-50=0x²-23x+102=0x²+5x-176=0x²-8x-20=0
x²-16x+39=0x²+32x+240=0x²+34x+288=0x²+22x+105=0x²+19x-20=0
x²-7x+6=0x²+4x-221=0x²+6x-91=0x²+8x+12=0x²+7x-120=0
x²-18x+17=0x²+7x-170=0x²+6x+8=0x²+13x+12=0x²+24x+119=0
x²+11x-42=0x²+2x-289=0x²+13x+30=0x²-24x+140=0x²+4x-60=0
x²+27x+170=0x²+27x+152=0x²-2x-99=0x²+12x+11=0x²+20x+19=0
x²-2x-168=0x²-13x+30=0x²-10x-119=0
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__________________.
二、选择题
1.方程5x2+75=0的根是()A.5B.-5C.±5D.无实根
2.方程3x2-1=0的解是()A.x=±B.x=±3C.x=±D.x=±
3.方程4x2-0.3=0的解是()
A.B.C.D.
4.方程=0的解是()A.x=B.x=±C.x=±D、x=±
5.已知方程ax2+c=0(a≠0)有实数根,则a与c的关系是()
A.c=0B.c=0或a、c异号C.c=0或a、c同号D.c是a的整数倍
6.关于x的方程(x+m)2=n,下列说法正确的是
A.有两个解x=±B.当n≥0时,有两个解x=±-m
C.当n≥0时,有两个解x=±D.当n≤0时,方程无实根
7.方程(x-2)2=(2x+3)2的根是
A.x1=-,x2=-5B.x1=-5,x2=-5C.x1=,x2=5D.x1=5,x2=-5
三、解方程
(1)x2=4
(2)x2=16(3)2x2=32(4)x2=8.
(5)(x+1)2=0(6)2(x-1)2=0(7)(2x+1)2=0(8)(2x-1)2=1
(9)(2x+1)2=3(10)(x+1)2-144=0
一、填空题
1.=__________,a2的平方根是________.
2.用配方法解方程x2+2x-1=0时
①移项得__________________②配方得__________________
即(x+__________)2=__________
③x+__________=__________或x+__________=__________
④x1=__________,x2=__________
3.用配方法解方程2x2-4x-1=0
①方程两边同时除以2得__________②移项得__________________③配方得__________________
④方程两边开方得__________________
⑤x1=__________,x2=__________
4、为了利用配方法解方程x2-6x-6=0,我们可移项得___________,方程两边都加上_________,得_____________,化为___________.解此方程得x1=_________,x2=_________.
5、填写适当的数使下式成立.
①x2+6x+______=(x+3)2②x2-______x+1=(x-1)2③x2+4x+______=(x+______)2
二、选择题
1、一元二次方程x2-2x-m=0,用配方法解该方程,配方后的方程为()
A.(x-1)2=m2+1B.(x-1)2=m-1C.(x-1)2=1-mD.(x-1)2=m+1
2、用配方法解方程x2+x=2,应把方程的两边同时()
A.加B.加C.减D.减
三、解答题
1、列各方程写成(x+m)2=n的形式
(1)x2-2x+1=0
(2)x2+8x+4=0(3)x2-x+6=0(4)x2-6x+8=0
2、将下列方程两边同时乘以或除以适当的数,然后再写成(x+m)2=n的形式
(1)2x2+3x-2=0
(2)x2+x-2=0
3.用配方法解下列方程
(1)x2+5x-1=0
(2)2x2-4x-1=0(3)(4)
(5).(6)(7)(8)
(9)(10)
(1)x2+4x-4=0
(2)x2-4x-4=0(3)(4)
(5).(6)(7)(8)
(9)(10)(11)(12)
(13)4x2+4x-1=0(14)2x2-4x-1=0(15)(16)
(17).(18)(19)(20)
(21)(22)(23)
一、填空题
1、填写解方程3x(x+5)=5(x+5)的过程
解:
3x(x+5)__________=0(x+5)(__________)=0
x+5=__________或__________=0∴x1=__________,x2=__________
2、用因式分解法解方程9=x2-2x+1
(1)移项得__________;
(2)方程左边化为两个平方差,右边为零得_________;
(3)将方程左边分解成两个一次因式之积得______;
(4)分别解这两个一次方程得x1=_____,x2=______.
3、x(x+1)=0的解是;
4、3x(x-1)=0的解是;
5、(x-1)(x+1)=0的解是;;
6、(2x-1)(x+1)=0的解是;
7、x2—16x=0的解是;
8、x2+8x+16=0的解是;
二、选择题
1.方程x2-x=0的根为()
A.x=0B.x=1C.x1=0,x2=1D.x1=