\(\text{ta có:}\frac{6}{a\left(a+7\right)}+1=\frac{\left(a+1\right)\left(a+6\right)}{a\left(a+7\right)}\text{ do đó:}A=\frac{2.7}{1.8}.\frac{3.8}{2.9}.....\frac{101.106}{100.107}\)
\(=\frac{2.3...101.\left(7.8....106\right)}{1....101.\left(8.9.....107\right)}=\frac{7}{107}\)
Tính nhanh E=\(\frac{6}{8+1}.\frac{6}{18+1}.\frac{6}{30+1}...\frac{6}{10700+1}\)
Tính nhanh:
F=\(\left(\frac{6}{8}+1\right)\left(\frac{6}{18}+1\right)\left(\frac{6}{30}+1\right).....\left(\frac{6}{10700}+1\right)\)
Tính :
\(C=\left(\frac{6}{8}+1\right).\left(\frac{6}{18}+1\right).\left(\frac{6}{30}+1\right).....\left(\frac{6}{10700}+1\right)\)
Giúp mình với mình cần gấp
Tính :
\(A=\left(\frac{6}{8}+1\right)\left(\frac{6}{18}+1\right)\left(\frac{6}{30}+1\right)...\left(\frac{6}{10700}+1\right)\)
Giúp cái !!!
Tính: A=\(\left(\frac{6}{8}+1\right)\cdot\left(\frac{6}{18}+1\right)\cdot\left(\frac{6}{30}+1\right)\cdot...\cdot\left(\frac{6}{10700}+1\right)\)
Tính giá trị biểu thức sau :
\(B=\left(\frac{6}{8}+1\right)\left(\frac{6}{18}+1\right)\left(\frac{6}{30}+1\right)...\left(\frac{6}{10700}+1\right)\)
Bài 2 : Tính
\(D=\left(\frac{6}{8}+1\right).\left(\frac{6}{30}+1\right)....\left(\frac{6}{10700}+1\right)\)
HÃY CỐ GẮNG GIÚP MÌNH NHA CÁC P
\(\left(\frac{6}{8}+1\right)\)\(+\left(\frac{6}{18}+1\right)+\left(\frac{6}{30}+1\right)+...+\left(\frac{6}{10700}+1\right)\)
giúp mình giải bài này nữa
tính nhanh : \(A=\frac{1}{6}+\frac{1}{12}+\frac{1}{20}+\frac{1}{30}+\frac{1}{42}+\frac{1}{56}\)
