Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

You are not logged in.

- Topics: Active | Unanswered

- Index
- » Search
- »
**Posts by math**

Pages: **1**

the teacher were given me ( can you post the solution )

**math**- Replies: 2

a,b,c>0 . Prove the inequality :

1/[a.\sqrt{a+b}] + 1/[b.\sqrt{b+c}]+1/[c.\sqrt{c+a}] >= 3/(\sqrt{2abc}

the problem were unsolve in along time ago !!!!!!!!!

**math**- Replies: 0

triangle ABC (AB<AC ) , AD is a bisector prove with all I, J on AD we have

angleJBI >angleJCI

next week , i will give the proof to my teacher ,please , !!!!!!!

very thanks to ganesh !!!!

nobody

thanks . I will be waiting for you

your proff is wrong . please help me in problem B,C

MathsIsFun wrote:

Where did they come from? I had a quick look and found I couldn't give an immediate answer

i don't understand . Why !!!!!!!!!!!!!!

are you have the answer of the problem ????

please i'm very very need !!!!!!!

can you post the answer ?

nobody can help me !!!!!!!!

**math**- Replies: 21

A)

I is a point in triangle ABC such that angle IBA > angle ICA , angle IBC > angle ICB , BI cut AC at B' , CI cut AB at C' . PRove the : BB' < CC'

please help me i'm very thanks

and the second problem

B)

a,b,c>0 prove the equation have 1 root :

d^3 - d(ab+bc+ca) - 2abc =0 .

from the equation and x,y,z >0 . ax+by+cz=xyz . Prove the inequality

x+y+z >= 2/d . (\sqrt[(a+d)(b+d)(c+d)])

C)in assemble N ,every number is white or black so that white + black=black

prove : white + white = white

Pages: **1**

- Index
- » Search
- »
**Posts by math**