Ta có:\(3^a=9^{b-1}=3^{2b-2}\Rightarrow a=2b-2\)
\(2^{a+8}=8^b=2^{3b}\Rightarrow a+8=3b\Rightarrow a=3b-8\)
\(\Rightarrow\left(3b-8\right)-\left(2b-2\right)=b-6=0\Rightarrow b=6\)
\(\Rightarrow a=2b-2=2.6-2=10\)
Ta có:\(3^a=9^{b-1}=3^{2b-2}\Rightarrow a=2b-2\)
\(2^{a+8}=8^b=2^{3b}\Rightarrow a+8=3b\Rightarrow a=3b-8\)
\(\Rightarrow\left(3b-8\right)-\left(2b-2\right)=b-6=0\Rightarrow b=6\)
\(\Rightarrow a=2b-2=2.6-2=10\)
tim cap so tu nhien (a, b )thoa man :
\(3^a=3^{n+1}va8^h=2^{a+8}\)
Tim cac cap so nguyen thoa man dieu kien :
1/a+b/2=5/8
cho 4 so tu nhien a b c d thoa man b+c+d/a=a+c+d/b=d+a+b/c=a+b+c/d=k Tim k
tong hai so tu nhien a, b thoa man (a+1)^2 + (b-2)^2 = 4.
tong hai so tu nhien a,b thoa man: (a+1)^2 + (b-2)^2 = 4 la? jup mik
Tim so tu nhien n thoa man \(\frac{n+3}{n^2-9}\)la so tu nhien.
Giai cu the ra cho minh nhe!!!
so cap so duong a va b thoa man 1/a -1/b=1/a-b
tim so tu nhien n thoa man de 2^n-1 chia het cho 259
Cau 1; cho\(\frac{x}{2}=\frac{y}{5}\)vaxy=90. So cap (x;y) thoa man la
Cau 2 : Cho a+d=b+c va \(a^2+d^2=b^2+c^2\)(b,d khac 0).Khi do 4 so lap thanh ti le thuc nao
Cau 3 :GTLN cua phan so \(\frac{7n-8}{2n-3}\)
Cau 4: Cho A=\(\frac{12}{x-15}\) dieu kien de 0<A<1 va A>1
Cau 5 ; tim x biet /-x-5//x=5=10
Cau 6: tap hop cac so nguyen cua x thoa man (3x^2-51)^2014=(-24)^2014
Cau 7: tap hop cac so thoa man /x-y/+/y+9/25/=0