Tính nhanh:
(-1 1/3). (-1 1/4). (-1 1/5) ... (-1 1/2012)
Tính nhanh:
(-1 1/3). (-1 1/4). (-1 1/5)... (-1 1/2012)
Tính nhanh:
(-1 1/3). (-1 1/4). (-1 1/5) ... (-1 1/2012)
Tính nhanh
\(\frac{2014+\frac{2013}{2}+\frac{2012}{3}+\frac{2011}{4}+\frac{2010}{5}+...+\frac{2}{2013}+\frac{1}{2014}}{\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+\frac{1}{5}+...+\frac{1}{2012}+\frac{1}{2013}+\frac{1}{2014}}\)
Giải tự luận hộ mình nha!!!!!!!! Mình cảm ơn!!!
Đặt phân thức trên là D
=> D=(1+1+1+1+...+1+2013/2+2012/3+...+2/2013+1/2014)/(1/2+1/3+1/4+...+1/2014)
=> D=(1+2013/2+1+2012/3+1+2011/4+...+1+2/2013+1+1/2014+1)/(1/2+1/3+1/4+1/5+...+1/2014)
=> D=(2015/2+2015/3+2015/4+...+2015/2013+2015/2014+1)/(1/2+1/3+1/4+...+1/2014)
=> D=[2015*(1/2+1/3+1/4+1/5+....+1/2014)]/(1/2+1/3+1/4+1/5+...+1/2014)
=> D=2015
UwU
ư uwsuuuuuuuuuuuu kimochiiiiiiiiiiiiiiiiiiii
đùa thôi đáp án: 2015 nha bn
ư ư wsuuuuuuuuuuuuuuuuuuuuuuuuuu kimmmmmooooochiiiiiiiiiii
À quên nhớ FOLOW CHO TUI NHA!
Thực hiện phép tính-tính nhanh giá trị biểu thức
A=19\(\dfrac{1}{4}\) + \(\dfrac{1}{2}\)x 2\(\dfrac{1}{3}\)+5,75 - \(\dfrac{1}{6}\)+74
B=[(\(\dfrac{1}{3}+\dfrac{1}{4}\))] x \(\dfrac{12}{19}+\dfrac{12}{19}\)] : \(\dfrac{4}{5}-\dfrac{1}{4}+2012\)
C=\(\dfrac{232323}{353535}:\dfrac{76x47-28}{76x46+48}\)
tính nhanh giá trị biểu thức
1-1/2+1/3-1/4+1/5-1/6+....+1/2011-1/2012
-------------------------------------------------------------
1006-1006/1007-1007/1008-1008/1009-...-2010/2011-2011/2012
---------- là phần nha
trình bày cách giải
Tính nhanh (1/1):2+(1/2):3+1/3:4+...+(1/2012):2013+(1/2013):2014
Ta có:
\(=\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+...+\frac{1}{2013.2014}\)
Ta thấy :
\(\frac{1}{1.2}=\frac{1}{1}-\frac{1}{2}\)
\(\frac{1}{2.3}=\frac{1}{2}-\frac{1}{3}\)
\(...\)
\(\frac{1}{2013.2014}=\frac{1}{2013}-\frac{1}{2014}\)
Ta có:
\(=\frac{1}{1}-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+...+\frac{1}{2013}-\frac{1}{2014}\)
\(=1-\frac{1}{2014}\)
\(=\frac{2013}{2014}\)
mãi k có ai trả lời ai piết thỳ làm hộ nha đang cần gấp
tính nhanh \(\left(-1\frac{1}{3}\right).\left(-1\frac{1}{4}\right).\left(-1\frac{1}{5}\right)....\left(-1\frac{1}{2012}\right)\)
\(\left(-1\frac{1}{3}\right).\left(-1\frac{1}{4}\right).\left(-1\frac{1}{5}\right)....\left(-1\frac{1}{2012}\right)=\frac{-2}{3}.\frac{-3}{4}.....\frac{-2011}{2012}=\frac{2}{2012}=\frac{1}{1006}\)
hình như có chỗ nhầm:
\(=\frac{-4}{3}\cdot\frac{-5}{4}\cdot\frac{-6}{5}\cdot...\cdot\frac{-2013}{2012}\)
Tính nhanh:
(-1 1/3). (-1 1/4). (-1 1/5)... (-1 1/2012)
\(\left(-1\dfrac{1}{3}\right)\left(-1\dfrac{1}{4}\right)\left(-1\dfrac{1}{5}\right)...\left(-1\dfrac{1}{2012}\right)\)
\(=\dfrac{-4}{3}.\dfrac{-5}{4}.\dfrac{-6}{5}...\dfrac{-2013}{2012}\)
=\(\dfrac{2013}{3}\)
= 671
Bài 1
a, Tính P=1+1/2(1+2)+1/3(1+2+3)+1/4(1+2+3+4)+....+1/2012(1+2+3+...+2012)
b,Tìm x thỏa mãn 4^5+4^5+4^5+4^5/3^5+3^5+3^5.6^5+6^5+6^5+6^5+6^5+6^5/2^5+2^5=2^x
Kho..................wa.....................troi.....................thi......................lanh.................ret.......................ai........................tich..........................ung.....................ho........................minh.....................cho....................do....................lanh
Kho..................wa.....................troi.....................thi......................lanh.................ret.......................ai........................tich..........................ung.....................ho........................minh.....................cho....................do....................lanh