tính tổng S= 1/6+1/12+1/20+1/30+1/42+1/56
Tính tổng: \(B=\dfrac{1}{2}+\dfrac{1}{6}+\dfrac{1}{12}+\dfrac{1}{20}+\dfrac{1}{30}+\dfrac{1}{42}\)
a) tính tổng A= 1/6+1/12+1/20+1/30+1/42+1/56
cho mình cả cách làm ạ^^
Tính tổng A= 1-5/6+7/12-9/20+11/30-13/42+15/56-17/72+1/90
Tính
1. A= 1/2+1/6+1/12+/1/20+1/30+1/42+1/56
2. B = 3/2+5/6+7/12+-9/20+11/30-13/42+15/56
1, tính tổng
A=1/2+5/6+11/12+19/20+29/30+41/42+55/56+71/72
Tính nhanh
1/2 + 1/6 + 1/12 + 1/20 + 1/30 + 1/42
Tính: 1/2 + 1/6 + 1/12 + 1/20 + 1/30 + 1/42 + 1/56
1. tính A= 1/6+1/12+1/20+1/30+1/42+...+1/110