\(\frac{x-4}{2015}-\frac{1}{2015}=\frac{10-2x}{2015}\)
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\(\frac{x-4}{2015}-\frac{1}{2015}=\frac{10-2x}{2015}\)
\(\Rightarrow\frac{x-4}{2015}-\frac{10-2x}{2015}=\frac{1}{2015}\)
\(\Rightarrow\frac{x-4-\left(10-2x\right)}{2015}=\frac{1}{2015}\)
\(\Rightarrow\frac{\left(x+2x\right)-\left(4+10\right)}{2015}=\frac{1}{2015}\)
\(\Rightarrow\frac{3x-14}{2015}=\frac{1}{2015}\)
\(\Rightarrow\left(3x-14\right).2015=2015\)
\(\Rightarrow3x-14=1\) ( bớt cả 2 vế đi 2015 lần )
\(\Rightarrow3x=15\)
\(\Rightarrow x=5\)
Vậy \(x=5\)
\(\frac{x-1}{2015}-\frac{1}{2015}=\frac{10-2x}{2015}\)
\(\Rightarrow x-1-1=10-2x\)
\(\Rightarrow x-2=10-2x\)
\(\Rightarrow-2x+x=10+2\)
\(\Rightarrow-x=12\Rightarrow x=-12\)
mẫu số = nhau nên tử số = nhau
x-4 -1 = 10-2x
3x = 10+4+1
3x = 15
x = 5
\(2^x+2^{x+4}=272\)
\(< =>2^x.\left(1+2^4\right)=272\)
\(< =>2^x.17=272\)
\(< =>2^x=272:17\)
\(< =>2^x=16\)
\(< =>2^x=2^4\)
\(=>x=4\)
\(B=\frac{2016}{1}+\frac{2015}{2}+...+\frac{2}{2015}+\frac{1}{2016}\)
\(B=2016+\frac{2015}{2}+...+\frac{2}{2015}+\frac{1}{2016}\)
\(B=1+\left(\frac{2015}{2}+1\right)+...+\left(\frac{2}{2015}+1\right)+\left(\frac{1}{2016}+1\right)\)
\(B=\frac{2017}{2017}+\frac{2017}{2}+...+\frac{2017}{2015}+\frac{2017}{2016}\)
\(B=2017\left(\frac{1}{2}+\frac{1}{3}+...+\frac{1}{2016}+\frac{1}{2017}\right)\)
\(\frac{B}{A}=\frac{2017\left(\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+...+\frac{1}{2016}+\frac{1}{2017}\right)}{\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+...+\frac{1}{2016}+\frac{2}{2017}}=2017\)
x-4-1 = 10-2x
x = 5
nhanh chưa bn
x=5
k mik nha
mik k lại cho bạn heng