Tính giúp tơ với
\(\frac{2}{151}+\frac{2}{152}+\frac{2}{153}+...+\frac{2}{300}\)
Tính nhanh \(\frac{2}{151}+\frac{2}{152}+\frac{2}{153}+...+\frac{2}{300}\)
Tính nhanh: \(\frac{2}{151}+\frac{2}{152}+\frac{2}{153}+...+\frac{2}{300}\)
Tính \(\frac{2}{151}+\frac{2}{152}+\frac{2}{153}+...+\frac{2}{300}\)
Tìm x:
(\(\frac{3}{1.2}+\frac{3}{3.4}+\frac{3}{5.6}+...+\frac{3}{299.300}\)) X ( \(x+\frac{2}{3}\)) = \(\frac{2}{151}+\frac{2}{152}+\frac{2}{153}+...+\frac{2}{300}\)
Tìm x (\(\frac{3}{1.2}+\frac{3}{3.4}+\frac{3}{5.6}+...+\frac{3}{299.300}\)) x (\(x+\frac{2}{3}\)) = \(\frac{2}{151}+\frac{2}{152}+...+\frac{2}{300}\)
So sánh:
a) \(\frac{-152}{151}\) và \(\frac{-153}{152}\) b) \(\frac{3213}{3214}\)và \(\frac{9875}{9876}\)
CMR: 1/151+1/152+1/153+…+1/300=1-1/2+1/3-1/4+…+1/299-1/300
CMR:S=1/2+1/3+1/4+…1/2013
Tính nhanh:
\(C=\frac{1}{2}+\frac{1}{14}+\frac{1}{35}+\frac{1}{65}+\frac{1}{104}+\frac{1}{152}\)
