Sao đề lạ dữ vậy bạn kiểm tra lại xem cái phần B ấy

Đúng rồi bạn ạ

a<1

B>1

=>A<B

k minh nha

A < 1

B > 1

Vậy a < b

bằng 15 hay sao ý

#)Giải :

\(\left(\frac{2012}{2015}+\frac{2011}{2016}+\frac{2010}{2016}+\frac{2009}{2018}\right)\left(\frac{1}{6}+\frac{1}{3}+\frac{1}{2}\right)\)

\(=\left(\frac{2012}{2015}+\frac{2011}{2016}+\frac{2010}{2016}+\frac{2009}{2018}\right)\left(\frac{1}{2}+\frac{1}{2}\right)\)

\(=\left(\frac{2012}{2015}+\frac{2011}{2016}+\frac{2010}{2016}+\frac{2009}{2018}\right)\times0\)

\(=0\)

\(\left(\frac{2012}{2015}+\frac{2011}{2016}+\frac{2010}{2017}+\frac{2009}{2018}\right).\left(\frac{1}{6}+\frac{1}{3}+\frac{1}{2}\right)\)

\(=\left(\frac{2012}{2015}+\frac{2011}{2016}+\frac{2010}{2017}+\frac{2009}{2018}\right).\left(\frac{1}{6}+\frac{2}{6}+\frac{3}{6}\right)\)

=\(\left(\frac{2012}{2015}+\frac{2011}{2016}+\frac{2010}{2017}+\frac{2009}{2018}\right).0\)

\(=0\)

Theo mik là bỏ 2015

<=> \(\frac{2017-1}{2014+2016}\)

\(=\frac{2016}{4030}\)

= ??? (bạn tự rút gọn nhé)

câu này bằng 2019

1.

a,\(\left(2013\times2014+2014\times2015+2015\times2016\right)\times\left(1+\frac{1}{3}-1\frac{1}{3}\right)\)

\(=\left(2013\times2014+2014\times2015+2015\times2016\right)\times\left(1\frac{1}{3}-1\frac{1}{3}\right)\)

\(=\left(2013\times2014+2014\times2015+2015\times2016\right)\times0\)

\(=0\)

b, \(17,75+16,25+14,75+13,25+...+4,25+2,75+1,25\)

 \(=\left(17,75+1,25\right)+\left(16,25+2,75\right)+...+9,75\)

\(=19\times7+9,75\)

\(=142,75\)

Hok Tốt!!!!

\(a,\left(2013×2014+2014×2015+2015×2016\right)×\left(1+\frac{1}{3}-1\frac{1}{3}\right)\)

\(=A×\left(1+\frac{1}{3}-\frac{4}{3}\right)\)

\(=A×\left(\frac{4}{3}-\frac{4}{3}\right)\)

\(=A×0\)

\(=0\)

\(A=\frac{1+2+3+...+2015}{2016}\)

\(A=\frac{\left(2015+1\right)\times2015:2}{2016}\)

\(A=\frac{\text{2031120}}{2016}\)

\(A=\text{1007,5}\)

\(\frac{1}{6}.\frac{1}{3}+\frac{17}{6}.\frac{1}{3}+\frac{2015}{2016}-1\)

\(=\frac{1}{3}\left(\frac{1}{6}+\frac{17}{6}\right)+\frac{2015}{2016}-1\)

\(=\frac{1}{3}.3+\frac{2015}{2016}-1\)

\(=1-1+\frac{2015}{2016}=\frac{2015}{2016}\)

\(\frac{1}{6}\times\frac{1}{3}+\frac{17}{6}\times\frac{1}{3}+\frac{2015}{2016}-1\)

\(=\left(\frac{1}{6}+\frac{17}{6}\right)\times\frac{1}{3}+\frac{2015}{2016}-1\)

\(=3\times\frac{1}{3}+\frac{2015}{2016}-1\)

\(=1+\frac{2015}{2016}-1\)

\(=0+\frac{2015}{2016}=\frac{2015}{2016}\)

Ta có:

\(2016^{0^{2015}}+1=1+1=2\)

sau chu so 02015 no doc doc vay ban 

\(\left(1-\frac{1}{2}\right)\times\left(1-\frac{1}{3}\right)\times\left(1-\frac{1}{4}\right)\times...\times\left(1-\frac{1}{2015}\right)\times\left(1-\frac{1}{2016}\right)\)

\(=\frac{1}{2}\times\frac{2}{3}\times\frac{3}{4}\times...\times\frac{2014}{2015}\times\frac{2015}{2016}\)

\(=\frac{1}{2016}\)

Giải : Ta có                (1-1/2)*(1-1/3)*(1-1/4)*....*(1-1/2015)*(1-1/2016)  

                                = 1* -(1/2+1/3+1/4+....+1/2015+1/2016)

                                = 1* - (1/2+1/2016 +1/3+1/2015 +...+1/1007)

                                = 1* -(1/2033134)

                                = -1/2033134