1/30+1/42+1/56+1/72+....+1/210
=1/5.6+1/6.7+1/7.8+1/8.9+...+1/14.15
=1/5-1/6+1/6-1/7+1/7-1/8+....+1/14-1/15
=1/5-1/15
=2/15
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1/30+1/42+1/56+1/72+....+1/210
=1/5.6+1/6.7+1/7.8+1/8.9+...+1/14.15
=1/5-1/6+1/6-1/7+1/7-1/8+....+1/14-1/15
=1/5-1/15
=2/15
A =1/30+1/42+1/56+1/72+...+1/210
A = 1/30 + 1/42 + 1/56 + 1/72 +...+ 1/210 =?
tính nhanh: A=1/30+1/42+1/56+1/72+...+1/210
tính nhanh :
A = 1/30 + 1/42 + 1/56 + 1/72 + ... + 1/210
Tính Nhanh
A = 1/30+1/42+1/56+1/72+...+1/210
Tính :
\(A=\frac{1}{30}+\frac{1}{42}+\frac{1}{56}+\frac{1}{72}+...+\frac{1}{210}\)
A=\(\frac{1}{30}+\frac{1}{42}+\frac{1}{56}+\frac{1}{72}+....+\frac{1}{210}\)
Tính nhanh :
A=1/30 + 1/42 + 1/56 + 1/72 + ... + 1/210
B=2/2.3 + 2/3.4 + 2/4.5 + ... + 2/99.100
tính nhanh:1/30+1/42+1/56+1/72...+1/210= bao nhiêu
giải ra
ai nhanh nhất mk k cho nha