giải pt

T

tunglam_95_01

nếu bài tâp bắt tìm nghiêm dương thi de hơn
Vi dieu dien la . X lon hon hoac =2
X nho hon hoc =4{vay x chi co the la 2,3,4} thay vao he chi co 3 thoa man
=>x =3
 
Last edited by a moderator:
T

thongoc_97977

[TEX]<=>(x-3)(\frac{1}{\sqrt{x-2}+1}-\frac{1}{\sqrt{4-x}+1}-2x-1)=0[/TEX]
[TEX]<=>x=3 [/TEX](Do[TEX]\frac{1}{\sqrt{x-2}+1}\leq 1<\frac{1}{\sqrt{4-x}+1}+2x+1,\forall x\in [2;4] [/TEX]
 
Top Bottom