5x²-6x+k=0
x²-6/5x+k/5=0
x²-6/5x+9/25-9/25+k/5=0
(x-3/5)²=9/25-k/5
9/25-k/5≥0 有实数解
所以 k/5≤9/25
k≤9/5
将方程5x的2次方-6x+k=0化为(x+a)的2次方=b,并且指出k为何值时方程有实数解
将方程5x的2次方-6x+k=0化为(x+a)的2次方=b,并且指出k为何值时方程有实数解
数学人气：687 ℃时间：2020-03-31 10:40:54
优质解答
我来回答
类似推荐
猜你喜欢
- 1董仲舒罢黜百家 独尊儒术的思想为什么被汉武帝接受
- 2Really just friends! Kind of sad feeling中文翻译
- 3Mary is a nice girl and she likes dogs very much.翻译
- 4如图1,在三角形ABC中,角A=45度,AC=根号2,AB=根号3+1,BC=?
- 5空间四点A B C D共面而不共线那么这四点中（ ） A必有3点共线 B必有3点不共线 C至少有3点共线
- 6六倍体小麦含42个染色体,将其单倍体幼苗茎尖用秋水仙素处理后所得植株细胞中所含染色体数不可能是：14 为什么?
- 7___(see) a car following him,he sped up his own car.
- 8what are you going to be in the future?I'd like to be a teacher_you are
- 9对于学习写作文你有什么看法
- 10We have there m_____a day,breakfast,lunch and supper的空格中填什么?