Tính giá trị biểu thức \(M=\frac{2016^{10}+2016^{11}}{2016^{10}-2016^{11}}\)
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M=\(\frac{2016^{10}+2016^{11}}{2016^{10}-2016^{11}}=-\frac{2017}{2015}\)
Theo đề ta có:
\(\frac{2016^{10}+2016^{11}}{2016^{10}-2016^{11}}\)
\(=\frac{2016^{10}\cdot\left(2016^0+2016^1\right)}{2016^{10}\cdot\left(2016^0-2016^1\right)}\)
\(=\frac{2016^0+2016}{2016^0-2016}\)
\(=\frac{1+2016}{1-2016}\)\(=\frac{2017}{-2015}\)\(=\frac{-2017}{2015}\)
\(M=\frac{2016^{10}+2016^{11}}{2016^{10}-2016^{11}}=\frac{2016^{10}\left(1+2016\right)}{2016^{10}\left(1-2016\right)}=\frac{-2017}{2015}\)
a/ Điều kiện xác định \(\hept{\begin{cases}a^2+a\ne0\\a^2-a\ne0\end{cases}\Leftrightarrow\hept{\begin{cases}a\ne0\\a\ne1\\a\ne-1\end{cases}}}\)
b/ \(M=\frac{a^2-1}{2016+2015a^2}\left(\frac{2015a-2016}{a+a^2}+\frac{2016+2015a}{a^2-a}\right)\)
\(=\frac{\left(a-1\right)\left(a+1\right)}{2016+2015a^2}\left(\frac{2015a-2016}{a\left(a+1\right)}+\frac{2016+2015a}{a\left(a-1\right)}\right)\)
\(=\frac{\left(a-1\right)\left(a+1\right)}{2016+2015a^2}\left(\frac{2015a-2016}{a\left(a+1\right)}+\frac{2016+2015a}{a\left(a-1\right)}\right)\)
\(=\frac{\left(a-1\right)\left(a+1\right)}{2016+2015a^2}.\frac{2\left(2015a^2+2016\right)}{a\left(a+1\right)\left(a-1\right)}\)
\(=\frac{2}{a}=\frac{2}{2016}=\frac{1}{1008}\)
X16+y / X16-y
=> X16-y+y+y / X16-y
=> X16-y/X16-y + y/X16-y
=>1 + y/x16-y
k mk nha. Chúc bạn tốt
https://olm.vn/hoi-dap/detail/104380939254.html?pos=228315034049
bạn coi thử nha
Ta có:
A = -1 – 2 + 3 + 4 – 5 – 6 + 7 + 8 – 9 – 10 + 11 + 12 - ... – 2013 – 2014 + 2015 + 2016
A = (0 – 1 – 2 + 3) + (4 – 5 – 6 + 7) + ... + (2012- 2013 – 2014 + 2015) + 2016
A = 0 + 0 + ... + 0
A = 2016
Vậy A = 2016
#Mạt Mạt#