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\(n=\frac{1995\times1994-1}{1993\times1995+1994}\)
\(n=\frac{1995\times\left(1993+1\right)-1}{1995\times1993+1994}\)
\(n=\frac{1995\times1993+1995\times1-1}{1995\times1993+1994}\)
\(n=\frac{1995\times1993+1994}{1995\times1993+1994}\)
\(n=1\)(vì TS = MS)
\(\frac{1995.1994-1}{1993.1995+1994}=\frac{1995.1994-1}{\left(1994-1\right)1995+1994}=\frac{1995.1994-1}{1994.1005-1995+1994}=\frac{1995.1994-1}{1994.1995-1}=1\)
Vậy n = 1
\(a,\frac{1995}{1996}.\frac{19961996}{19311931}.\frac{193119311931}{199519951995}\) \(c,\frac{1997.1996-1}{1995.1997+1996}\)
\(=\frac{1995}{1996}.\frac{1996}{1931}.\frac{1931}{1995}\) \(=\frac{1997.\left(1995+1\right)-1}{1995.1997+1996}\)
\(=\frac{1995.1996.1931}{1996.1931.1995}\) \(=\frac{1997.1995+1997-1}{1997.1995+1996}\)
\(=1\) \(=\frac{1997.1995+1996}{1995.1997+1996}\)
\(=1\)
Ý (a) giống ý (b)
Ý (c) giống ý (d)
1996 * 1995 - (996 + 1000 + 1996*1996)
= 1996*1995 - (1996 x (1 + 1996))
= 1996*(1995 - 1996 - 1)
= 1996* -2
=-3992
1996 * 1995 - (996 + 1000 + 1996*1996)
= 1996*1995 - (1996 x (1 + 1996))
= 1996*(1995 - 1996 - 1)
= 1996* -2
=-3992
\(\frac{\left|x\right|+2015}{2016}\) . Có: \(\left|x\right|\ge0\Rightarrow\left|x\right|+2015\ge2015\Rightarrow\frac{\left|x\right|+2015}{2016}\ge\frac{2015}{2016}\)
Dấu = xảy ra khi \(x+2015=0\Rightarrow x=0\)
Vậy \(Min\frac{\left|x\right|+2015}{2016}=\frac{2015}{2016}\) tại \(x=0\)
\(\frac{\left|x\right|+1996}{-1997}\) có \(\left|x\right|\ge0\Rightarrow\left|x\right|+1996\ge1996\Rightarrow\frac{\left|x\right|+1996}{-1997}\le-\frac{1996}{1997}\)
Dấu = xảy ra khi \(\left|x\right|+1996=1996\Rightarrow x=0\)
Vậy \(Max\frac{\left|x\right|+1996}{-1997}=\frac{1996}{-1997}\) tại \(x=0\)
\(\frac{1997\times1996-1}{1995\times1997+1996}\)
\(=\frac{1997\times\left(1995+1\right)-1}{1995\times1997+1996}\)
\(=\frac{1997\times1995+1997-1}{1995\times1997+1996}\)
\(=\frac{1997\times1995+1996}{1995\times1997+1996}=1\)
\(=\frac{2016.2017+2018.21+1996}{2017.2016+2018.2017}\)
\(=\frac{2018.21+1996}{2018.2017}\)
\(=\frac{21+1996}{2017}\)
\(=\frac{2017}{2017}\)
\(=1\)
Đặt A = 1996 x 1995 - 996
Đặt B = 1000 + 1996 x 1994
Ta có:
A = (1996 - 996) x 1995
= 1000 x 1995
1995000
B = 1000 x (1996 + 1994)
= 1000 x 3990
= 3990000
Ta rút gọn:1995000/3990000 = 2
Mình tính ra = 2 nhưng ko biết có đúng ko
bằng 1/2 mới đúng