Các câu hỏi tương tự
tim x biet : 1/3+1/6+1/10+1/15+...+2/x*(x+1) = 999/1000
a,Tim so tu nhien x, biet: 5^x ×5^x+1×5^x+2=1000...0 (2018 cs 0) ÷2^18
b,CMR voi moi so tu nhien n thi ƯCLN (21n+1,14n+3)=1
tim so nguyen x , biet : -1 + 3 - 5 + 7 - ... + x = 200
tim so nguyen x biet 1+3+5+7+...+x=256
Tim x biet
1/3×5+1/5×7+.....+1/(2x+1)(2x+3)=100/609
Tim x biet
a)x(2y-1)-2y=-7
b)2|x|/3+|y|/2=5/3
tim x,y biet
a, (x-3).y= 7
b, (x-1) . (xy-5)
Tim x biet -1+3+(-5)+7+...+x=600
giup minh voi
tim x biet 2.(x-5)-3.(x+7)=14