M=5/28+5/70+...+5/700
M=5/4.7+5/4.10+...+5/25.28
3/5M=1/4-1/28
3/5M=3/14
M=5/14
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M=5/28+5/70+...+5/700
M=5/4.7+5/4.10+...+5/25.28
3/5M=1/4-1/28
3/5M=3/14
M=5/14
tinh tổng :M=10/56+10/140+......+10/1400
tính tong 10/56 + 10/140 + 10/260 + ..... + 10/1400
tinh nhanh
10/56+10/140+10/260+...+10/1400
tính M = 10/56+10/140+10/416+.....+10/1400
Tính tổng: M=10/56+10/140+10/260+...+10/1400
tính M=10/56+10/140+1/26+...+10/1400
tính tổng M=\(\dfrac{10}{56}+\dfrac{10}{140}+\dfrac{10}{260}+....+\dfrac{260}{1400}\)
Tính tổng một cách hợp lý:
M = 10/56 + 10/140 + 10/260 + ... + 10/1400
H = 10/56+10/140+10/260+10/1400