(2.1.2+1/1.2) + (2.2.3+1/2.3) + (2.3.4+1/3.4) +...+ (2.9.10/9.10) = ?
anh chị giúp em nhé
\(x = {{2.1.2+1} \over 1.2}+{{2.2.3+1} \over 2.3}+ {{2.3.4+1} \over 3.4}+{{2.4.5+1} \over 4.5}+...+{{2.9.10+1} \over 9.10}\)
(2.1.2 + 1/1.2) + (2.2.3 + 1/2.3) + (2.3.4 + 1/3.4) + (2.4.5 + 1/4.5)+...+(2.9.10 + 9/10) = ?
3. \(\frac{\left(1+2^2+3^2+...+2005^2\right).12}{2.3+4.6+6.9+...+4010.6015}\)
GIẢI CHI TIẾT NHA. LẸ NHA. THANKS
\(1,\frac{3737.43-4343.37}{1^2+2^3+...+27^2}=\frac{101.43.37-101.43.37}{..........}=0\)
1/1.2 + 1/2.3 + 1/3.4 + ....+ 1/9.10
\(\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+...+\)\(\frac{1}{9.10}\)
\(=\frac{1}{1}-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}\)\(...+\frac{1}{9}-\frac{1}{10}\)
\(=1-\frac{1}{10}\)
\(=\frac{9}{10}\)
ủng hộ mik nha mn
=1-1/2+1/2-1/3+1/3-1/4+....+1/9-1/10
=1-1/10
=9/10
Em chao anh anh ket ban voi em nhe
=1-1/2+1/2-1/3+1/4-1/5+1/5-1/6+....+1/9-1/10
=1-1/10=9/10
KET BAN VOI EM NHE
Tinh tong: S= 1/1.2 + 1/2.3+ 1/ 3.4 ..... + 1/9.10?
S=\(\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+.....+\frac{1}{9.10}\)
S=\(1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+...+\frac{1}{9}-\frac{1}{10}\)
S=\(\frac{1}{10}-1\)
S=\(\frac{9}{10}\)
1/1.2+1/2.3+1/3.4...+1/9.10
\(=\frac{1}{1}-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+...+\frac{1}{9}-\frac{1}{10}\)
\(=\frac{1}{1}-\frac{1}{10}\)
\(=\frac{9}{10}\)
\(\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+...+\frac{1}{9.10}\)
\(=\frac{1}{1}-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+...+\frac{1}{9}-\frac{1}{10}\)
\(=\frac{1}{1}-\frac{1}{10}=\frac{9}{10}\)
\(\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+...+\frac{1}{9.10}\)
=\(\frac{1}{1}-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+...+\frac{1}{9}-\frac{1}{10}\)
=\(\frac{1}{1}-\frac{1}{10}\)
=\(\frac{9}{10}\)
1/1.2+5/2.3+11/3.4+...+89/9.10
Tính
a 1/1.2+1/2.3+1/3.4+.......+1/9.10
bằng 9/10 đó bạn
* mình nha, thanks ^.^
đặt A= 1/1.2+1/2.3+1/3.4+.......+1/9.10,ta có:
\(\Leftrightarrow A=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+...-\frac{1}{9}+\frac{1}{9}-\frac{1}{10}\)
\(\Rightarrow A=1-\frac{1}{10}\)
\(\Rightarrow A=\frac{10}{10}-\frac{1}{10}\)
\(\Rightarrow A=\frac{9}{10}\)
10.(1/1.2+5/2.3+11/3.4+...+89/9.10)