a)=3^4<3.n<3^10
=>n=4;5;6;7;8;9
b)5^2<5^n-1<5^4
=>n-1=3=>n=4
c)5.5^2n==5^6
=>5^2n+1=5^6
=>n=7/2
a)=3^4<3.n<3^10
=>n=4;5;6;7;8;9
b)5^2<5^n-1<5^4
=>n-1=3=>n=4
c)5.5^2n==5^6
=>5^2n+1=5^6
=>n=7/2
tim tat ca cc so nguyen n thoa man cac dang thuc sau 25n/5n = 53n , ta co
A n=3
B n=-1
C n=1
D n=-3
1 tim cac so nguyen x,y biet x/7=6/21 -5/y=20/28 1/2=x/12 x/8=-28/32 3/y=12/24 3/4=15/y 2 viet 3 phan so bang phan so -10/15
tim cac so nguyen n de\(\frac{3n-1}{n-1}\) co gia tri la so nguyen
tinh
(1/16-1)x(1/25-1)x(1/36-1)x...x(1/100-1)
tim so nguyen x;y biet
2014^x+4y=2013
Tim n de phan so sau co gia tri nguyen va tinh gia tri do:
A=3n+9/n-4
Tim so nguyen n sao sao cho
A=(n^3 + 3n^2 + 2n + 5) : (n+2) la so nguyen
1/3+2/32+3/33+4/34+...+n/3n<3/4 tìm n biết(n thuộc n*,n>3
1,\(\frac{\frac{3}{3}-\frac{3}{5}+\frac{3}{11}+\frac{3}{13}}{\frac{7}{3}-\frac{7}{5}+\frac{5}{11}+\frac{5}{13}}\)
2,a,tim x biet:
a,\(\left(3x-2\right)^{10}=\left(3x-2\right)^6\) b\(\left(2x^2-13\right)^4=\left(-5\right)^4\)
3,tim so nguyen n de phan so sau co gia tri la 1 so nguyen va tinh gia tri do
a,A=\(\frac{3n+9}{n-4}\) b,B=\(\frac{6n+5}{2n-1}\)
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3n + 3 + 5n + 3 + 3n + 1 + 5n + 2 = ?