1-1/3+1/3-1/5+1/5-1/7+.......+1/37-1/39
1-1/39
38/39
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1/1.2.3+1/2.3.4+1/3.4.5+...+1/37.38.39
1/1.2.3+1/2.3.4+1/3.4.5+....+1/37.38.39 = ?
1/1.2.3+1/2.3.4+1/3.4.5+...+1/37.38.39
Tính tổng A= 1/1.2.3 +1/2.3.4+1/3.4.5+.......+1/37.38.39
tinhs
1/1.2.3+1/2.3.4+1/3.4.5+............+1/37.38.39
1/1.2.3+1/2.3.4+1/3.4.5+......+1/37.38.39 =?
tinh A= 1/1.2.3 + 1/2.3.4 +1/3.4.5 + ... +1/36.37.38 +1/ 37.38.39
Tính nhanh\(\frac{1}{1.2.3}+\frac{1}{2.3.4}+\frac{1}{3.4.5}+...+\frac{1}{37.38.39}\)
Tính:
\(\frac{1}{1.2.3}+\frac{1}{2.3.4}+\frac{1}{3.4.5}+...+\frac{1}{37.38.39}\)