tinh nhanh
a=\(\frac{2017.2016-1}{2017.2015+2016}\)
ai nhanh mk bam
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(\frac{1}{2016}+\frac{2017\cdot2015}{2016}-2016\)
\(=\frac{1}{2016}+\frac{\left(2016+1\right)\left(2016-1\right)}{2016}-2016\)
\(=\frac{1}{2016}+\frac{2016^2-1}{2016}-2016\)
\(=\frac{1+2016^2-1-2016^2}{2016}=\frac{0}{2016}=0\)
\(B=1+\frac{1}{2}+\frac{1}{2^2}+\frac{1}{2^3}+...+\frac{1}{2^{2016}}\)
\(B=1+\frac{1+1+1+...+1}{2+2^2+2^3+...+2^{2016}}=1+\frac{1+1+1+...+1}{2^{1+2+3+...+2016}}\)
\(B=1+\frac{2016}{2^{2033136}}=1\frac{2016}{2^{2033136}}\)
\(\frac{1}{1\cdot2}+\frac{1}{2\cdot3}+\frac{1}{3\cdot4}+.....+\frac{1}{2016\cdot2017}=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+.........+\frac{1}{2016}-\frac{1}{2017}\)
\(=1-\frac{1}{2017}=\frac{2016}{2017}\)
= 1/1-1/2+1/2-1/3+1/3-............-1/2017
=1-1/2017
=2016/2017
a) \(-\dfrac{215}{340}=-\dfrac{43}{68}\)
b) \(\dfrac{25\cdot13}{26\cdot35}=\dfrac{5}{2\cdot7}=\dfrac{5}{14}\)
c) \(\dfrac{-2017\cdot2016+1}{-2015\cdot\left(-2017\right)+2016}=-1\)
\(a,\dfrac{-215}{340}=\dfrac{-215:5}{340:5}=\dfrac{-43}{68}\)
\(b,\dfrac{25.13}{26.35}=\dfrac{5.5.13}{2.13.7.5}=\dfrac{5}{2.7}=\dfrac{5}{14}\)
\(\dfrac{-2017.2016+1}{-2015.-2017+2016}=-1\)
\(a=\frac{2017.2015+2017-1}{2017.2015+2016}=\frac{2017.2015+2016}{2017.2015+2016}=1\)1
A=\(\frac{2017.2016-1}{2017\left(2015+1\right)+2016-2015}\)
A=\(\frac{2017.2016-1}{2017.2016+1}\)
A=\(\frac{-1}{1}\)