2011 nhân 2012 + 4022
phần
2013 nhân 2014 - 4028
2011 nhân 2012 + 4022
phần
2013 nhân 2014 - 4028
tính nhanh
(2011 × 2012 + 4022) /(2013 × 2014 - 4028)= 0
(2011 × 2012 + 4022) /(2013 × 2014 - 4028)=1
2011 nhân 21012 + 4022
phần
2013 nhân 2014 + 4028
2011*2012+4022/2013 * 2014-4028
2011/2010 *2012/2011 * 2013/2012 * 2014/2013 * 1005/1007
dấu * là dấu nhân
\(\frac{2011}{2010}\times\frac{2012}{2011}\times\frac{2013}{2012}\times\frac{2014}{2013}\times\frac{1005}{1007}\)
\(=\frac{2014}{2010}\times\frac{1005}{1007}\)
\(=\frac{2\times1007\times1005}{2\times1005\times1007}\)
\(=1\)
\(\frac{2011}{2010}\cdot\frac{2012}{2011}\cdot\frac{2013}{2012}\cdot\frac{2014}{2013}\cdot\frac{2010}{2014}\)
\(=\frac{2010\cdot2011\cdot2012\cdot2013\cdot2014}{2010\cdot2011\cdot2012\cdot2013\cdot2014}\)
= 1
\(\frac{2011}{2010}.\frac{2012}{2011}.\frac{2013}{2012}.\frac{2014}{2013}.\frac{1005}{1007}=\frac{2014}{2010}.\frac{1005}{1007}\)
\(\frac{2014}{2010}.\frac{1005}{1007}=\frac{1007}{1005}.\frac{1005}{1007}=1\)
Tính nhanh:2011*2012+4022/2013*2014-4028 các bạn ơi cái này tính ra phân số nhé:
2354Y5EJYRU5421W3ERTHJY432ER
4 050 154 / 4 050 154
ok bạn nhớ !!!
bạn tính như thế nào vậy bạn ghi luôn cả cách giải đi
Chứng minh rằng : \(\frac{1}{4028}< \left(\frac{1}{2}.\frac{3}{4}.....\frac{2011}{2012}.\frac{2013}{2014}\right)^2< \frac{1}{2015}\)
Không tính cụ thể , hãy sắp xếp các biểu thức sau theo thứ tự giảm dần :
\(\frac{\frac{2010}{2011}}{\frac{2012}{2013}}+\frac{\frac{2011}{2012}}{\frac{2013}{2014}}+\frac{\frac{2012}{2013}}{\frac{2014}{2015}}\)
\(\frac{\frac{2010}{2011}+\frac{2011}{2012}+\frac{2012}{2013}}{\frac{2012}{2013}+\frac{2013}{2014}+\frac{2014}{2015}}\)
\(\frac{\frac{2010+2011+2012}{2011+2012+2013}}{\frac{2012+2013+2014}{2013+2014+2015}}\)
\(\frac{\frac{2010}{2011}+\frac{2011}{2012}+\frac{2012}{2013}}{\frac{2012+2013+2014}{2013+2014+2015}}\)
\(\frac{\frac{2010+2011+2012}{2011+2012+2013}}{\frac{2012}{2013}+\frac{2013}{2014}+\frac{2014}{2015}}\)
$\frac{\frac{2010}{2011}}{\frac{2012}{2013}}+\frac{\frac{2011}{2012}}{\frac{2013}{2014}}+\frac{\frac{2012}{2013}}{\frac{2014}{2015}}$
$\frac{\frac{2010}{2011}}{\frac{2012}{2013}}+\frac{\frac{2011}{2012}}{\frac{2013}{2014}}+\frac{\frac{2012}{2013}}{\frac{2014}{2015}}$
$\frac{\frac{2010+2011+2012}{2011+2012+2013}}{\frac{2012+2013+2014}{2013+2014+2015}}$
$\frac{\frac{2010}{2011}+\frac{2011}{2012}+\frac{2012}{2013}}{\frac{2012+2013+2014}{2013+2014+2015}}$
$\frac{\frac{2010+2011+2012}{2011+2012+2013}}{\frac{2012}{2013}+\frac{2013}{2014}+\frac{2014}{2015}}$
\(\frac{1}{4028}< \left(\frac{1}{2}\cdot\frac{3}{4}\cdot\frac{5}{6}\cdot.......\cdot\frac{2011}{2012}\cdot\frac{2013}{2014}\right)^2< \frac{1}{2015}\)
cho 2014x2013x2013x2012.x=2011x2012x2013x2014 giá trị của x là:
A.2014
b.2013
c.2012
d.2011
Lưu ý:dấu chấm(.)trong đề là dấu nhân
\(2014.2013.2013.2012.x=2011.2012.2013.2014\)
\(\Rightarrow x=\dfrac{2011.2012.2013.2014}{2014.2013.2013.2012}\)
\(\Rightarrow x=\dfrac{2011}{2013}\)
Bạn xem lại đề