M= 1/1975*(2+1/1945-1)-1/1945*(1-2/1975)-1974/1975*1946/1945-3/1975*1945
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5 tháng 9 2018 lúc 21:13
Tính M=\(\dfrac{1}{1975}\left(\dfrac{2}{1945}-1\right)-\dfrac{1}{1945}\left(1-\dfrac{2}{1975}\right)+\dfrac{1974}{1975}\times\dfrac{1946}{1945}-\dfrac{3}{1975\times1945}\)
Ta có : P = \(\dfrac{1}{1975}\left(\dfrac{2}{1945}-1\right)-\dfrac{1}{1945}\left(1-\dfrac{2}{1975}\right)+\dfrac{1974}{1975}.\dfrac{1946}{1945}\)
\(-\dfrac{3}{1975.1945}\)
= \(\dfrac{2}{1975.1945}-\dfrac{1}{1975}-\dfrac{1}{1945}+\dfrac{2}{1975.1945}+\dfrac{1974}{1975}.\dfrac{1946}{1945}\)
\(-\dfrac{3}{1975.1945}\)
= \(\dfrac{2+2+1974.1946-3-1975-1945}{1975.1945}\)
= \(\dfrac{2+2+1974.1946-3-1975-1945}{1975.1945}\)
= \(\dfrac{1973}{1975}\)
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\(M=\frac{1}{1975}.\left(\frac{2}{1975}-1\right)-\frac{1}{1945}.\left(1-\frac{2}{1975}\right)-\frac{1974}{1975}.\frac{1946}{1945}-\frac{3}{1975.1945}\)
nho khô nha
1/1945*1945+1/1946*1946+1/1947*1947+...+1/1974+*1974+1/1975*1975<1/1944
Tính giá trị biểu thức
\(M=\frac{1}{1975}.\left(\frac{2}{1975}-1\right)-\frac{1}{1945}.\left(1-\frac{2}{1975}\right)-\frac{1974}{1975}.\frac{1946}{1945}-\frac{3}{1975.1945}\)
Rút gọn biểu thức : \(B=\frac{1}{1975}\times\left(\frac{2}{1945}-1\right)-\frac{1}{1945}\times\left(1-\frac{2}{1975}\right)-\frac{1974}{1975}\times\frac{1946}{1945}-\frac{3}{1975\times1945}\)
Tính nhanh:
A = \(\dfrac{1}{1975}\left(\dfrac{2}{1975}-1\right)+\left(1-\dfrac{2}{1945}\right)+\dfrac{1974}{1975}.\dfrac{1945}{1946}\)
Rút gọn biểu thức
\(B=\frac{1}{1975}.\left(\frac{2}{1945}-1\right)-\frac{1}{1945}.\left(1-\frac{2}{1975}\right)-\frac{1974}{1975}.\frac{1946}{1945}-\frac{3}{1975.1945}\)
=\(\frac{1}{1975}.\frac{2}{1945}-\frac{1}{1975}-\frac{1}{1975}-\frac{1}{1975}.\frac{2}{1975}-\frac{1974}{1975}.\frac{1946}{1945}-\frac{3}{1975.1945}\)
=\(\frac{1}{1975}.\left(\frac{2}{1945}-1-1-\frac{2}{1975}\right)-\frac{1974.1946}{1975.1945}-\frac{3}{1975.1945}\)
=\(\frac{1}{1975}.\left(\frac{2}{1945}-\frac{2}{1975}-2\right)-\frac{1974.1946-3}{1975.1945}\)
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Tính giá trị của biểu thức:
\(B=\frac{1}{1975}\left(\frac{2}{1945}-1\right)-\frac{1}{1945}\left(1-\frac{2}{1975}\right)-\frac{1974}{1975}.\frac{1946}{1945}-\frac{3}{1975.1945}\)
Giúp mình với. Ai nhanh cho Like nhé! ^^
Tính Q = \(\dfrac{1}{1275}.\left(\dfrac{x}{1945}-1\right)-\dfrac{1}{1945}.\left(1-\dfrac{x}{1975}\right)-\dfrac{1974}{1975}.\dfrac{1946}{1945}-\dfrac{3}{1975.1945}\)
