对于方程ax^2+bx+c=0,若b^2-4ac>=0,则
x=[-b加或减根号下(b^2-4ac)]/2a
当b^2-4ac=0时,有且只有一个解
当b^2-4ac>0时,有双解.
上题:x=±√15-3
猜你喜欢
- 1James :Do you like your new school ,lucy?Lucy:yes,I really like them Everyone is very nice.
- 2雷锋的故事
- 3求中国的一些传统节日的鲜为人知的习俗小故事,不要都知道的那种.英语作文当素材!
- 4李叔叔把3000元钱存入银行整存整取5年年利率是5.50%到期时 李叔叔的本金加利息一共多少钱、?
- 5look!the student is helping the old man cross the road
- 6英语翻译
- 7描写男生眼睛的片段300字以上
- 8小莉上街买哟福,一件衣服打了八折,后来有优惠了15%,小莉花了150元钱.这件衣服原价是多少?
- 9it is as clear as daylight that
- 10This term I am going to work () the wall newspaper .A.about B.with C.for D.to