Tính tỉ số \(\dfrac{A}{B}\) biết:
\(A=\dfrac{1}{1.300}+\dfrac{1}{2.301}+\dfrac{1}{3.302}+...+\dfrac{1}{101.400}\) và
\(B=\dfrac{1}{1.102}+\dfrac{1}{2.103}+\dfrac{1}{3.104}+...+\dfrac{1}{299.400}\)
A = \(\frac{1}{1.300}\)+ \(\frac{1}{2.301}\)+ \(\frac{1}{3.302}\)+ . . . . . .+ \(\frac{1}{101.400}\)
B = \(\frac{1}{1.102}\)+ \(\frac{1}{2.103}\) + \(\frac{1}{3.104}\)+ . . . . . . + \(\frac{1}{299.400}\)
Tính \(\frac{A}{B}\)
cho \(A=\frac{1}{1.300}\)+ \(\frac{1}{2.301}\)+\(\frac{1}{3.302}\)+.....+\(\frac{1}{101.400}\)
\(B=\frac{1}{1.102}\)+\(\frac{1}{2.103}\)+\(\frac{1}{3.104}\)+.......+\(\frac{1}{299.400}\)
Chứng tỏ rằng \(\frac{A}{B}\)không pải là số nguyên
Tinh
a)M=\(\dfrac{2012-\dfrac{1}{9}-\dfrac{2}{10}-\dfrac{3}{11}-...-\dfrac{2012}{2020}}{\dfrac{1}{27}+\dfrac{1}{30}+\dfrac{1}{33}+...+\dfrac{1}{6060}}\)
b)N=\(\dfrac{\dfrac{1}{1.300}+\dfrac{1}{2.301} +\dfrac{1}{3.302}+...+\dfrac{1}{101.400}}{\dfrac{1}{1.102}+\dfrac{1}{2.103}+\dfrac{1}{3.104}+...+\dfrac{1}{299.400}}\)
Bài 1: Tính giá trị biểu thức
A= \(\frac{\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+...+\frac{1}{2018}}{\frac{2017}{1}+\frac{2016}{2}+\frac{2015}{3}+...+\frac{1}{2017}}\)
B= \(\frac{\frac{1}{51}+\frac{1}{53}+\frac{1}{55}+...+\frac{1}{149}}{\frac{1}{101.99}+\frac{1}{103.97}+...+\frac{1}{149.51}}\)
C= \(\frac{1+\frac{1}{3}+\frac{1}{5}+...+\frac{1}{99}}{\frac{1}{1.99}+\frac{1}{3.97}+...+\frac{1}{99.1}}\)
D= \(\frac{\frac{1}{1.300}+\frac{1}{2.301}+\frac{1}{3.302}+...+\frac{1}{101.400}}{\frac{1}{1.102}+\frac{1}{2.103}+\frac{1}{3.104}+...+\frac{1}{299.4000}}\)
Bài 2: Tìm x, biết:
a) \(\frac{x+1}{2014}+\frac{x+2}{2013}+...+\frac{x+1007}{1008}=\frac{x+1008}{1007}+\frac{x+1009}{1006}+...+\frac{x+2014}{1}\)
b) \(\frac{2}{\left(x-1\right)\left(x-3\right)}+\frac{5}{\left(x-3\right)\left(x-8\right)}+\frac{12}{\left(x-8\right)\left(x-20\right)}-\frac{1}{x-20}=\frac{-1}{4}\)
Các bạn làm hết giúp mik nha! ^ ^
Tính tỉ số B A , biết: 2008 1 2007 2 ... 3 2006 2 2007 1 2008 2009 1 2008 1 2007 1 ... 4 1 3 1 2 1 = + + + + + = + + + + + + B A
Tính tỉ số A/B biết:
A=1/2+1/3+1/4+...+1/2007+1/2008+1/2009
B=2008/1+2007/2+2006/3+...+2/2007+1/2008
*A/B là phân số.
Tính tỉ số A/B biết:
A=1/2 + 1/3 + 1/4 + ... + 1/2017 + 1/2018 + 1/2019
B=2018/1 + 2017/2 + 2016/3 + ... + 2/2017 + 1/2018
Tính tỉ số a/b, biết :
A=1/2+1/3+1/4+1/5+.....+1/2008+1/2009
B=2008/1+2007/2+2006/3+....+2/2007+1/2008
