Các câu hỏi tương tự
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) +...+ (2.9.10/9.10) = ?
\(\frac{3737.43-4343.37}{1^2+2^2+3^2+...+27^2}\) \(\frac{2^2.2+2^2.2.3+2^2.3.4+...+2^2.99.100}{2.1.2+2.2.3+2.3.4+...+2.99.100}\)
Xem chi tiết
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
A = 1/1.2 + 1/2.3 + 1/3.4 + 1/4.5 + 1/5.6
a=1/1.2=1/2.3+1/3.4+1/4.5+....+1/49.5
Tính 1/1.2 + 1/2.3 + 1/3.4 + 1/4.5 +1/5.6
tính nhanh
\(\dfrac{1}{1.2}+\dfrac{1}{2.3}+\dfrac{1}{3.4}+\dfrac{1}{4.5}=?????\)
bai 1 : a = 1.2+2.3+3.4+4.5+5.6+............+99.100
1.3+3.5+5.7 +9.11 +..........+2011.2013
1+4+9+16+ ...............+ 9801+10000
a=1.2.3+2.3.4+..........+98.99.100
bai 2 : a ) [ -2008.57+1004.(-86 )]:[32.74+16.(-48)
b) 1+2-3-4+5+6-7-8+9+10-.........................+2006-2007-2008+2009
Câu 1 : 1.2+2.3+3.4+...+30.31
Câu 2 : 1.2.3+2.3.4+3.4.5+...+30.31.32
Câu 3 : 1/1.2+1/2.3+1/3.4+...+1/30.31
Câu 4 ; 1/1.3+1/3.5+...+1/99.101
Câu 5 : 1/1.4+1/4.7+...+1/91.94
Câu 6 : 1/1.2.3+1/2.3.4+1/3.4.5+...+1/31.32.33
Câu 7 : 1.1!+2.2!+3.3!+...+10.10!