Hỏi đáp - Câu hỏi mới nhất, lớp 9, môn Toán

MQ

mệ quá

14 tháng 10 2018 - olm

tìm giá trị của k để pt sau có 3 nghiệm pb :

\(\left(x-3\right)\left[x^2+\left(k-1\right)x+k^2\right]=0\)

tìm giá trị của k để pt sau có 2 nghiệm pb và cùng âm :

\((x-1)(x^2+kx+k-1)=0\)

#Hỏi cộng đồng OLM #Toán lớp 9

1

OG

Ối giời ối giời ôi

14 tháng 10 2018

Bo may la binh day k di hieu ashdbfgbgygygggydfsghuyfhdguuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu3

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MQ

mệ quá

14 tháng 10 2018 - olm

cho phương trình :\(x+3(m-3x^2)^2=m(1)\)

với giá trị nào của m thì pt \((1)\)có nghiệm

#Hỏi cộng đồng OLM #Toán lớp 9

1

OG

Ối giời ối giời ôi

14 tháng 10 2018

Bo may la binh day k di hieu ashdbfgbgygygggydfsghuyfhdguuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu3

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VD

Vũ duy phong

14 tháng 10 2018 - olm

Cho đường tròn đường kính BC,A thuộc đường tròn.Kẻ AH vuông góc với BC tại H.Đ,E là hình chiếu của H lên AB và AC.

A.Cmr BH=BC.cos^2

B.Biết góc B = 50 độ,AH=3cm,tính DH

#Hỏi cộng đồng OLM #Toán lớp 9

1

OG

Ối giời ối giời ôi

14 tháng 10 2018

Bo may la binh day k di hieu ashdbfgbgygygggydfsghuyfhdguuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu3

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TB

T Bé zai

14 tháng 10 2018 - olm

Cm\(\sqrt{\left(A^2+C^2\right)\left(B^2+D^2\right)}+\sqrt{\left(A^2+D^2\right)\left(B^2+C^2\right)}\)

#Hỏi cộng đồng OLM #Toán lớp 9

1

OG

Ối giời ối giời ôi

14 tháng 10 2018

Bo may la binh day k di hieu ashdbfgbgygygggydfsghuyfhdguuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu3

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HT

Hải Trần

14 tháng 10 2018 - olm

giải pt biết: \(\sqrt{x-1}+\sqrt{2x-1}=5\)

#Hỏi cộng đồng OLM #Toán lớp 9

1

OG

Ối giời ối giời ôi

14 tháng 10 2018

Bo may la binh day k di hieu ashdbfgbgygygggydfsghuyfhdguuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu3

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HT

Hải Trần

14 tháng 10 2018 - olm

tìm giá trị nhỏ nhất của A biết A=\(\frac{-3}{\sqrt{x}+3}\)

#Hỏi cộng đồng OLM #Toán lớp 9

1

OG

Ối giời ối giời ôi

14 tháng 10 2018

Bo may la binh day k di hieu ashdbfgbgygygggydfsghuyfhdguuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu3

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BN

Bui Ngoc Linh

14 tháng 10 2018 - olm

Giải và biện luận hệ phương trình

{2x-y=3+2m

{mx+y=(m+1)^2

#Hỏi cộng đồng OLM #Toán lớp 9

0

NM

Nguyễn Mai Lý

14 tháng 10 2018 - olm

Cho góc nhọn \(\alpha\).Rút gọn biểu thức: \(\sin^6\alpha+c\text{os}^6\alpha+3sin^2\alpha-c\text{os}^2\alpha\)

#Hỏi cộng đồng OLM #Toán lớp 9

0

LK

Linh Kiu's

14 tháng 10 2018 - olm

Tìm số tự nhiên \(k=\overline{ab}\)có hai chữ số sao cho \(k+ab=\left(a+b\right)^2\)

#Hỏi cộng đồng OLM #Toán lớp 9

0

PT

Pham Thi Yen Nhi

14 tháng 10 2018 - olm

Cho a,b >0 và a+b=1

TÌm MinS

S=\(\frac{a^3}{a+1}+\frac{b^3}{b+1}\)

2. Cho 0<a,b,c<2 . CM

\(\frac{1}{2-a}+\frac{1}{2-b}+\frac{1}{2-c}>=\frac{3}{2}+\frac{a^2+b^2+c^2}{2}\)

#Hỏi cộng đồng OLM #Toán lớp 9

0

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