tính Y ak e,nếu tính Y thì a giúp dc
Y=1
\(\frac{12}{13^2}+12:13:14:...:120\)
cuu voi
tìm x biết
a,\(|5x+\frac{3}{4}|-\frac{5}{4}=2\)
b,\(\frac{3}{2}-|\frac{1}{2}x+1|=\frac{1}{4}\)
cac ban lam on giup minh lam nhanh nhe
\(A=1+\frac{1}{2}+\frac{1}{2^2} +\frac{1}{2^3}+...+\frac{1}{2^{2012}}\)
ghi loi giai day du nha may ban
ai ghi du loi giai va nhanh minh se tick(toan lop 6 nhe)
chung minh rang
\(1-\frac{1}{2}+\frac{1}{3}-\frac{1}{4}+...+\frac{1}{199}-\frac{1}{200}=\frac{1}{101}+\frac{1}{102}+\frac{1}{103}+...+\frac{1}{200}\)
giup minh minh like cho nho giai chi tiet mot chut nhe
Cho A = \(\frac{1}{2^2}+\frac{1}{3^2}+.....+\frac{1}{2012^2}+\frac{1}{2013^2}\)
Hay Chung to rang A < 1
NHANH LEN NHA CAC BAN!
Tính \(A=2013+\frac{2013}{1+2}+\frac{2013}{1+2+3}+\frac{2013}{1+2+3+4}+...+\frac{2013}{1+2+3+...+2012}\)
Chứng minh rằng:
\(\frac{1}{2^2}+\frac{1}{3^2}+\frac{1}{4^2}+...+\frac{1}{2014^2}< \frac{2013}{2014}\)
chứng minh\(\frac{1}{2}-\frac{1}{3}+\frac{1}{4}-\frac{1}{5}+...+\frac{1}{2012}-\frac{1}{2013}+\frac{1}{2014}< \frac{2}{5}\)
chứng minh \(\frac{1}{2}-\frac{1}{3}+\frac{1}{4}-\frac{1}{5}+....+\frac{1}{2012}-\frac{1}{2013}+\frac{1}{2014}< \frac{2}{5}\)
Tính giá trị biểu thức B=\(2013+\frac{2013}{1+2}+\frac{2013}{1+2+3}+\frac{2013}{1+2+3+4}+...+\frac{2013}{1+2+3+...+2012}\)
