Sorry, mik nhầm

=> 3n+12-17 chia hết cho n+4

=> n+4 thuộc Ư(17)={1;-1;-17;17}

*n+4=1 =>n=-3

*n+4=-1 =>n=-5

*n+4=17 =>n=13

*n+4=-17 =>n=-21

CHÚC BN HỌC TỐT!

358000-47689=310311

573280-21645=551635

98357-21736=76621

456789-54321=402468

\(5\left(x:\frac{1}{2}\right)-5=5\)

Chia cả 2 vế cho 5 có:

\(x:\frac{1}{2}-1=1\)

\(2x=1+1=2\)

\(x=\frac{2}{2}=1\)

Ta có:

\(P=\frac{3a}{4}+\left(\frac{a}{8}+\frac{a}{8}+\frac{1}{a^2}\right)\ge\frac{3.2}{4}+\frac{3}{4}\left(AM-GM\right)=\frac{9}{4}\)\(P=\frac{3a}{4}+\left(\frac{a}{8}+\frac{a}{8}+\frac{1}{a^2}\right)\ge\frac{3}{2}+\frac{3}{4}=\frac{9}{4}\)

dấu "=" xảy ra khi a=2

15 * 15 = 225

nho ten minh