(1-1/2)x(1-1/3)x.....x(1-1/2014)x(1-1/2015)
=1/2x2/3x.....x2013/2014x2014/2015
=1/2015
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\(A=\left(6:\frac{3}{5}-1\frac{1}{6}x\frac{6}{7}\right):\left(4\frac{1}{5}x\frac{10}{11}+5\frac{2}{11}\right)\)\(B=\left(1-\frac{1}{2}\right)x\left(1-\frac{1}{4}\right)x.......x\left(1-\frac{1}{2015}\right)x\left(1-\frac{1}{2016}\right)\)
\(C=5\frac{9}{10}:\frac{3}{2}-\left(2\frac{1}{3}x4\frac{1}{2}-2x2\frac{1}{3}\right):\frac{7}{4}\)
A=(1-\(\frac{1}{2}\))x(1-\(\frac{1}{3}\))x(1- \(\frac{1}{4}\) )x....x(1-\(\frac{1}{2014}\) )x(1-\(\frac{1}{2015}\) )
A=
Nhập phân số tối giản
Tính nhanh:
A = (1 - \(\frac{1}{2}\)) x ( 1 - \(\frac{1}{3}\) ) x ( 1 - \(\frac{1}{4}\) ) x ...x ( 1 - \(\frac{1}{2014}\) ) x (1 - \(\frac{1}{2015}\))
Tính :
\(\left(1-\frac{1}{2}\right)x\left(1-\frac{1}{3}\right)x\left(1-\frac{1}{4}\right)x.......x\left(1-\frac{1}{2014}\right)x\left(1-\frac{1}{2015}\right)\)
Trả lời đầy đủ .Dấu x là dấy nhân.Đầy đủ sẽ được tick nhanh nhá
Tìm x(x>0)
\(\frac{2015}{2014}+\frac{1}{x}=\frac{1}{x+1}+\frac{2014}{2013}\)
a)\(\left(1-\frac{1}{2}\right)x\left(1-\frac{1}{3}\right)x\left(1-\frac{1}{4}\right)x\left(1-\frac{1}{5}\right)x......x\left(1-\frac{1}{18}\right)x\left(1-\frac{1}{19}\right)x\left(1-\frac{1}{20}\right)\)
b)\(1\frac{1}{2}x1\frac{1}{3}x1\frac{1}{4}x1\frac{1}{5}x......x1\frac{1}{2005}x1\frac{1}{2006}x1\frac{1}{2007}\)
Tính nhanh : \(\frac{1}{2}x\frac{1}{2}+\frac{1}{2}x\frac{1}{3}+\frac{1}{3}x\frac{1}{4}+\frac{1}{4}x\frac{1}{5}+\frac{1}{5}x\frac{1}{6}\)
Chứng minh rằng:
( 1 - \(\frac{1}{2}\)) x ( 1 - \(\frac{1}{3}\)) x ( 1 - \(\frac{1}{4}\)) x .... x ( 1 - \(\frac{1}{2014}\)) > \(\frac{1}{2015}\)
C=\(\left(1+\frac{1}{2}\right)x\left(1+\frac{1}{3}\right)x\left(1+\frac{1}{4}\right)x......x\left(1+\frac{1}{2015}\right)\)