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T= (1/2+ 1).(1/3+ 1) .(1/4+ 1)....(1/98+ 1). (1/99+ 1)
T= 3/2+4/3+5/4+...+99/98+100/99
T= 100/2
T= 50
\(T=\frac{3.4.5.6.....100}{2.3.4.5.6.....99}\)
Rút ra nhé:
\(T=\frac{100}{2}\)
T=50.
Chúc em học tốt^^
tính riêng:
\(\frac{1}{99}+\frac{2}{98}+\frac{3}{97}+...+\frac{99}{1}\)
=\(\left(\frac{100}{99}-1\right)+\left(\frac{100}{98}-1\right)+\left(\frac{100}{97}-1\right)+...+\left(\frac{100}{2}-1\right)+99\)
=\(100.\left(\frac{1}{99}+\frac{1}{98}+\frac{1}{97}+...+\frac{1}{2}\right)+99-98\)
=\(100.\left(\frac{1}{100}+\frac{1}{99}+\frac{1}{98}+\frac{1}{97}+...+\frac{1}{2}\right)\)
vậy \(\left(\frac{1}{99}+\frac{2}{98}+\frac{3}{97}+...+\frac{99}{1}\right):\left(\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+...+\frac{1}{100}\right)=100\)
chúc bạn học tốt ^^
R = \(\left(\dfrac{1}{2}+1\right)\cdot\left(\dfrac{1}{3}+1\right)\cdot....\cdot\left(\dfrac{1}{99}+1\right)\)
R = \(\dfrac{3}{2}\cdot\dfrac{4}{3}\cdot....\cdot\dfrac{100}{99}\)
R = \(\dfrac{3\cdot4\cdot...\cdot100}{2\cdot3\cdot...\cdot99}\)
R = 50
\(T=\left(\frac{1}{2}+1\right).\left(\frac{1}{3}+1\right).\left(\frac{1}{4}+1\right)....\left(\frac{1}{99}+1\right)\)
\(T=\left(\frac{1}{2}+\frac{2}{2}\right).\left(\frac{1}{3}+\frac{3}{3}\right).\left(\frac{1}{4}+\frac{4}{4}\right)......\left(\frac{1}{99}+\frac{99}{99}\right)\)
\(T=\frac{3}{2}.\frac{4}{3}.\frac{5}{4}......\frac{100}{99}=\frac{3.4.5.6.....100}{2.3.4.5...99}=\frac{100}{2}=50\)
Vậy T = 50
T={1/2 + 1} .{1/3+1} . {1/4+1}....{ 1/98+1].[1/99+1}
=3/2 . 4/3 . 5/4.....99/98 . 100/99
=1/2 . 1 . 1.....1. 100/1 (MIK RÚT GỌN CHÉO CÁC PHÂN SỐ LIỀN NHAU)
=100/2
=50 Nhé
Bài 1:
a: \(2A=2^{101}+2^{100}+...+2^2+2\)
\(\Leftrightarrow A=2^{100}-1\)
b: \(3B=3^{101}+3^{100}+...+3^2+3\)
\(\Leftrightarrow2B=3^{100}-1\)
hay \(B=\dfrac{3^{100}-1}{2}\)
c: \(4C=4^{101}+4^{100}+...+4^2+4\)
\(\Leftrightarrow3C=4^{101}-1\)
hay \(C=\dfrac{4^{101}-1}{3}\)
a,M=2^0-2^1+2^2-2^3+2^4-2^5+.....+2^2012
2M=2^1-2^2+2^3-2^4+2^5-2^5+......-2^2012+2^2013
3M=2^0+2^2013
M=(2^0+2^2013)÷3
Vậy.......
b,N=3-3^2+3^3-3^4+3^5-3^6+.....+3^2011-3^2012
3N=3^2-3^3+3^4-3^5+3^6-3^7+......+3^2012-3^2013
4N=3-3^2013
N=(3-3^2013)÷4
Vậy........
K tao nhé ko lên lớp tao đánh m😈😈😈
\(T=\left(\frac{1}{2}+1\right)\left(\frac{1}{3}+1\right)\left(\frac{1}{4}+1\right)+...+\left(\frac{1}{99}+1\right)\)
\(T=\frac{3}{2}.\frac{4}{3}.\frac{5}{4}.....\frac{100}{99}\)
\(T=\frac{1}{2}.100\)
\(T=50\)