\(C\text{=}\dfrac{1}{3}+\dfrac{1}{6}+\dfrac{1}{10}+\dfrac{1}{15}+\dfrac{1}{21}+\dfrac{1}{28}\)
\(C\text{=}\left(\dfrac{1}{3}+\dfrac{1}{6}\right)+\left(\dfrac{1}{10}+\dfrac{1}{15}\right)+\left(\dfrac{1}{21}+\dfrac{1}{28}\right)\)
\(C\text{=}\dfrac{1}{2}+\dfrac{1}{6}+\dfrac{1}{12}\)
\(C\text{=}\dfrac{3}{4}\)
tính nhanh
1+1/3+1/6+1/10+1/15+1/21+1/28+1/36
Tính: B=1/3+1/6+1/10+1/15+1/21+1/28
A=1+1/3+1/6+1/10+1/15+1/21+1/28+1/36+1/45
1/3+1/6+1/10+1/15+1/21+1/28+1/36+1/45
A= 1/3 + 1/6 + 1/10 + 1/15 + 1/21 +1/28 + 1/36 +1/45 + 1/55
tinh nhanh
A = 1/3 + 1/6 + 1/10 + 1/15 + 1/21 + 1/28
TÍNH 1+1/3+1/6+1/10+1/15+1/21+1/28+1/36+1/45+1/55+1/66
Tính nhanh giá trị biểu thức: M = 1/3+1/6+1/10+1/15+1/21+1/28+1/36+1/45
Tính nhanh giá trị biểu thức: M = 1/3+1/6+1/10+1/15+1/21+1/28+1/36+1/45
