问题标题：
200分求70道一元二次方程计算题!越多越好!不够也没关系!
问题描述：
200分求70道一元二次方程计算题!越多越好!不够也没关系!
刘志亮回答：
(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
已知:X平方+X+1=0则X平方+1/X平方(也就是X平方分之一)=?
1.在长为10（根号5+1）cm的线段AB上有一点C,且有AC^2=AB*BC,则AC长?
2.某旅馆有客房140间,当每间客房的日租金为60元时,每天都客满.如果一间客房的日租金增加5元,则客房每天的出租数会减少5间,当每间客房的日租金为多少元时,每日获得的总租金高达10000元?.
3.在等腰三角形ABC中.BC=6.AB.AC的长是关于x的方程x^2-10x+m=0的两个整数根,求m
4.用22㎝长的铁丝能不能折成一个32平方厘米的矩形?说明理由
5.若a为有理数,试探求当b为何值时,关于x的一元二次方程x^2+3(a-1)x+(2a^2+a+b)=0的根为有理数?
6.设关于y的一元二次方程3(m-2)y^2-2(m+1)y-m=0有正整数根,试探求满足条件的整数m
一,选择题:
1,下列方程(1)-x2+2=0(2)2x2-3x=0(3)-3x2=0(3)-3x2=0(4)x2+=0(5)=5x(6)2x2-3=(x-3)(x2+1)中是一元二次方程的有()
A,2个B,3个C,4个D,5个
2,下列配方正确的是()
x2+3x=(x+)2-(2)x2+2x+5=(x+1)2+4
(3)x2-x+=(
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