Tim 3 so nguyen to khac nhau a,b,c thoa man: a.b.c=3(a+b+c)
Giup mih nha minh dang can gap
tim cac so nguyen a;b;c thoa man dong thoi 3 dang thuc :a.b.c+a=2011;a.b.c+b=2013;a.b.c+c=2015
Tim cac so nguyen m,n,p thoa man p = m - n = m . n
Giup minh voi minh dang can gap
Ta có : \(m-n=mn\)
\(\Leftrightarrow mn-m+n=0\)
\(\Leftrightarrow m\left(n-1\right)+n-1=-1\)
\(\Leftrightarrow\left(m+1\right)\left(n-1\right)=-1\)\(\Leftrightarrow\orbr{\begin{cases}\hept{\begin{cases}m+1=-1\\n-1=1\end{cases}}\\\hept{\begin{cases}m+1=1\\n-1=-1\end{cases}}\end{cases}}\)\(\Leftrightarrow\orbr{\begin{cases}\hept{\begin{cases}m+1=-1\\n-1=1\end{cases}}\\\hept{\begin{cases}m+1=1\\n-1=-1\end{cases}}\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}\hept{\begin{cases}m+1=1\\n-1=-1\end{cases}}\\\hept{\begin{cases}m+1=-1\\n-1=1\end{cases}}\end{cases}}\)
biet a,b la 2 so nguyen to ko cung nhau thoa man a=2n+3;b=3n+1.Khi do UCLN(a,b)=.....?
nhanh len nha mk dang can gap
luu y: ko tra loi bang chtt hay cau hoi tuong tu
Cho bieu thuc A = 3/n-2
a) Tim cac so nguyen n de bieu thuc A la phan so
b) Tim cac so nguyen n de A la mot so nguyen
Cac giup minh nhe minh dang can gap.
chung minh rang neu a,b,c la cac so khac 0 thoa man ab+ac/2=bc+ba/3=ca+cb/4 thi a/3=b/5=c/15
mk dg can gap nha
ai lm dc (giai ki) mk tick cho
chung minh rang neu a,b,c la cac so khac 0 thoa man ab+ac/2=bc+ba/3=ca+cb/4 thi a/3=b/5=c/15
mk dg can gap nha
ai lm dc (giai ki) mk tick cho
chung minh rang neu a,b,c la cac so khac 0 thoa man ab+ac/2=bc+ba/3=ca+cb/4 thi a/3=b/5=c/15
mk dg can gap nha
ai lm dc (giai ki) mk tick cho
tim 3 so a,b,c khac nhau va khac 0 thoa man : a/(b+c) = b/(a+c) = c/(a+b)
cho so huu ti \(x=\frac{a-3}{2a}\)(a khac 0) vaoi gt nao cua a thi x la so nguyen
giai nhanh giup minh nha minh dang can rat gap !
Cam on nhieu nha !
Để x là số nguyên thì (a-3) chia hết cho 2a
=> 2.(a-3) chia hết cho 2a
=> (2a-6) chia hết cho 2a
=> 6 chia hết cho 2a => 2a \(\in\)Ư(6)
Đến đây bạn làm tiếp đc ko