Tim x E N
1+3+5 +...+(2X+1)+225
tim x thuộc N
a 2+4+6+...+2x=210
b 1+3+5+...+[2x-1]=225
c 1+2+3+...+x=278
d 1+3+5+...+[2x-1]=169
Tìm x E N
1 + 3 + 5 + ......+ ( 2x -1 ) = 225
tim so tu nhien x biet
1+3+5+....+(2x-1)=225
tim so tu nhien x
a) 2+4+6+.....+2x=210
b)1+3+5+.......+(2x-1)=225
tim x e N
6^x.6^3:6^5+81=11^2-4
(2x+1")^3-2012^0+63
1+3+5+7+........+2n-1=225
tim n
tim n thuoc N* biet
1+3+5+...+(2n-1)=225
Tìm x thuộc N* biết
a) 2+4+6+....+2x = 210
b) 1+3+5+.....+ (2x-1) = 225
