\(\frac{n-2}{n+2}-\frac{n-1}{n+2}+\frac{-4}{n+2}=\frac{n-2-n-1+\left(-4\right)}{n+2}=\frac{\left(n-n\right)-2-1+\left(-4\right)}{n+2}=\frac{-7}{n+2}\)
\(\Rightarrow n+2\inƯ\left(7\right)=\left\{-7;-1;1;7\right\}\)
| \(n+2\) | \(-7\) | \(-1\) | \(+1\) | \(+7\) |
| \(n\) | \(-9\) | \(-3\) | \(-1\) | \(5\) |
tim m,n thuoc Z biet
\(\frac{m}{2}-\frac{2}{n}=\frac{1}{2}\)
CMR :\(\frac{1}{2^2}+\frac{1}{3^2}+\frac{1}{4^2}+......+\frac{1}{n^2}< 1\)
(n Thuoc N;n lon hon hoac = 2
1 tim x,y,z biet
\(\frac{-4}{x}=\frac{y}{-14}=\frac{12}{21}=\frac{z}{-63}\)
2 tim n thuoc z n khac 0
a \(\frac{1111100:n}{23331:n}+\frac{-10}{-21}\)
b \(\frac{1075:n}{600:n}=\frac{43}{24}\)
Cho A= \(\frac{n+2}{n-5}\) ( n thuoc Z; n khac 5). Tim n de A thuoc Z
GIUP MINH NHE
tim n thuoc Z để các phân số sau nguyên:
a) \(\frac{3n-1}{4n+5}\)
b) \(\frac{2n+9}{n+2}\) - \(\frac{3n}{n+2}\) + \(\frac{5n+17}{n+2}\)
\(\frac{1}{n.\left(n+1\right).\left(n+2\right)}=\frac{1}{2}.\left[\frac{1}{n.\left(n+1\right)}-\frac{1}{\left(n+1\right).\left(n+2\right)}\right]\)
Ai làm được mk sẽ tick
1)cho phan so A=\(\frac{n+1}{n-2}\)
a tim n thuoc Z de A co gia tri nguyen
b tim n thuoc Z de A co gia tri lon nhat
Cho m, n thuoc N* va p la SNT thoa man: \(\frac{p}{m-1}=\frac{m+n}{p}\)
CM: p2=n+2
Cho phan so: P = \(\frac{2n+7}{5n+2}\)(n thuoc Z)
a)Tim n thuoc z de P la phan so chua toi gian.
b)Tim n thuoc Z sao cho P la phan so toi gian.