Question and Answers Forum

All Questions      Topic List

Algebra Questions

Previous in All Question      Next in All Question      

Previous in Algebra      Next in Algebra      

Question Number 151070 by mathdanisur last updated on 18/Aug/21

a+b+c=30   and   a;b;c>0  find the minimum value of  (1/a) + (1/b) + (1/c)

$$\mathrm{a}+\mathrm{b}+\mathrm{c}=\mathrm{30}\:\:\:\mathrm{and}\:\:\:\mathrm{a};\mathrm{b};\mathrm{c}>\mathrm{0} \\ $$ $$\mathrm{find}\:\mathrm{the}\:\mathrm{minimum}\:\mathrm{value}\:\mathrm{of} \\ $$ $$\frac{\mathrm{1}}{\mathrm{a}}\:+\:\frac{\mathrm{1}}{\mathrm{b}}\:+\:\frac{\mathrm{1}}{\mathrm{c}} \\ $$

Commented byjohn_santu last updated on 18/Aug/21

(1/a)+(1/b)+(1/c)≥(((1+1+1)^2 )/(a+b+c))=(9/(30))=(3/(10))

$$\frac{\mathrm{1}}{\mathrm{a}}+\frac{\mathrm{1}}{\mathrm{b}}+\frac{\mathrm{1}}{\mathrm{c}}\geqslant\frac{\left(\mathrm{1}+\mathrm{1}+\mathrm{1}\right)^{\mathrm{2}} }{\mathrm{a}+\mathrm{b}+\mathrm{c}}=\frac{\mathrm{9}}{\mathrm{30}}=\frac{\mathrm{3}}{\mathrm{10}} \\ $$

Commented bymathdanisur last updated on 18/Aug/21

Thank you Ser  what an inequality it was please

$$\mathrm{Thank}\:\mathrm{you}\:\mathrm{Ser} \\ $$ $$\mathrm{what}\:\mathrm{an}\:\mathrm{inequality}\:\mathrm{it}\:\mathrm{was}\:\mathrm{please} \\ $$

Commented byAri last updated on 20/Aug/21

Can you explain please how thid inequality is?

$$\mathrm{Can}\:\mathrm{you}\:\mathrm{explain}\:\mathrm{please}\:\mathrm{how}\:\mathrm{thid}\:\mathrm{inequality}\:\mathrm{is}? \\ $$

Commented byAri last updated on 20/Aug/21

Could you explain please how this enequality is?

$$\mathrm{Could}\:\mathrm{you}\:\mathrm{explain}\:\mathrm{please}\:\mathrm{how}\:\mathrm{this}\:\mathrm{enequality}\:\mathrm{is}? \\ $$

Terms of Service

Privacy Policy

Contact: info@tinkutara.com