\(x+3⋮x-1\) nhanh mink tick cho
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\(\left(x+\frac{1}{3}\right)^4=16\)
\(\Rightarrow\left(x+\frac{1}{3}\right)^4=2^4\)
\(\Rightarrow x+\frac{1}{3}=2\)
\(\Rightarrow x=2-\frac{1}{3}\)
\(\Rightarrow x=\frac{6}{3}-\frac{1}{3}\)
\(\Rightarrow x=\frac{5}{3}\)
\(S=\left(1-\frac{1}{2}\right).\left(1-\frac{1}{3}\right).....\left(1-\frac{1}{2017}\right)\)
\(S=\frac{1}{2}\cdot\frac{2}{3}\cdot\cdot\cdot\cdot\cdot\cdot\cdot\frac{2016}{2017}\)
\(S=\frac{1.2........2016}{2.3..........2017}\)
\(S=\frac{1}{2017}\)
21 - (25 - x + 21) = -(25 - 7) - (4 + x)
=> 21 - 25 + x - 21 = -25 + 7 - 4 - x
=> -25 + x = -22 - x
=> -25 + 22 = -x - x
=> -3 = -2x
=> x = 3/2
21- ( 25-x+21) = -(25-7) - (4+x)
21-(46-x) = -18 - 4 -x
21-46+x=-18-4-x
2x = 3
x = 3/2
=.= hk tốt!!
\(2\times\left(x-5\right)-17=25\)
\(2\times\left(x-5\right)=25+17\)
\(2\times\left(x-5\right)=42\)
\(x-5=42:2\)
\(x-5=21\)
\(x=21+5\)
\(x=26\)
2 * ( x - 5 ) = 25 + 17
2 * ( x - 5 ) = 42
x - 5 = 42 : 2
x - 5 = 21
x = 21 + 5
x = 26
\(\left(x+2\right)^3=\left(x+2\right)\)
\(\Rightarrow\left(x+2\right)^3-\left(x+2\right)=0\)
\(\Rightarrow\left(x+2\right).\left[\left(x+2\right)^2-1\right]=0\)
\(\Rightarrow\left[{}\begin{matrix}x+2=0\\\left(x+2\right)^2-1=0\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}x=-2\\\left(x+2\right)^2=1\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}x=-2\\x+2\in\left\{-1;1\right\}\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}x=-2\\x=-3\\x=-1\end{matrix}\right.\)
Vậy............
Chúc bạn học tốt!!!
Vì x+3 chia hết cho x-1
x+1 chia hết cho x+1
=>(x+3):(x+1)]:x+1
=>x+3-x-1)chia hết cho x+1
=> 2 chia hết cho x+1
=>x+1 thuộc Ư(2)={1,2}
Mà x+1≥1 nên=>x+1=(1,2)
=>x={0,1}
Vậy x+{0,1}
2;3;5;