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1)
B(37) = {0; 37; 74; 111;...}
2)
Ư(7) = {1; 7}
Ư(9) = {1; 3; 9}
Ư(10) = {1; 2; 5; 10}
Ư(16) = {1; 2; 4; 8; 16}
Ư(18) = {1; 2; 3; 5; 9; 18}
Ư(20) = {1; 2; 4; 5; 10; 20}
3)1) x = {0; 26; 39;52}
2) x = {0; 17; 34; 51}
3) x = {0; 12; 24; 36; 48;...}
4) x = {1; 2; 3; 5; 6; 10; 15; 30}
5) x = {0; 7; 14; 21; 28; 35; 42;49}
Sai thì thôi nha
HỌC TỐT!!!
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a) Ta có :
\(\left|x\right|\le6\)
\(\Leftrightarrow\left|x\right|\in\left\{0;1;2;3;4;5;6\right\}\) (do \(\left|x\right|\ge0\))
\(\Leftrightarrow x\in\left\{-6;-5;-4;-3;-2;-1;0;1;2;3;4;5;6\right\}\)
Vậy \(x\in\left\{-6;-5;-4;-3;-2;-1;0;1;2;3;4;5;6\right\}\)
b) Ta có :
\(2\le\left|y-1\right|\le3\)
\(\Leftrightarrow\left|y-1\right|\in\left\{2;3\right\}\)
\(\Leftrightarrow y-1\in\left\{-2;-3;2;3\right\}\)
\(\Leftrightarrow y\in\left\{-1;-2;3;4\right\}\)
c) \(\left(x+1\right)\left(y+2\right)=-12\)
Vì \(x,y\in Z\Leftrightarrow x+1;y-2\in Z,x+1;y-2\inƯ\left(-12\right)\)
Bn tự lập bảng rồi tính tiếp nhé!
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\(a,\)
Ta có :
\(\hept{\begin{cases}x\le y\\y\le x\end{cases}}\Rightarrow x=y\)
Mà \(y\le5\le x\)
\(\Rightarrow x=y=5\)
\(b,\)
Ta có : \(\hept{\begin{cases}b\le a\\a\le3\end{cases}}\Rightarrow b\le a\le3\)
Mà \(a\le b\)
\(\Leftrightarrow a=b\)
\(a,b\in N\Rightarrow a,b=\left\{0;1;2;3\right\}\)
a,
Ta có :
\(x\le y\)
\(y\le5\le x\)
Ta có :
\(x\le y\) \(;\) \(y\le x\)
\(\Leftrightarrow x=y\)
\(y\le5\Leftrightarrow x;y\le5\)
Mà \(x;y\in N\)
\(\Leftrightarrow x;y\in\left\{0;1;2;3;4;5\right\}\)
+,Còn ý b tương tự bạn tự làm nha! dễ mà.
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\(-10\le\left|5-x\right|\le2\)
\(\Rightarrow\left|5-x\right|=1;2\)
\(\Rightarrow5-x=\pm1\) hoặc \(5-x=\pm2\)
+) \(5-x=1\Rightarrow x=4\)
+) \(5-x=-1\Rightarrow x=6\)
+) \(5-x=2\Rightarrow x=3\)
+) \(5-x=-2\Rightarrow x=7\)
Vậy \(x\in\left\{4;6;3;7\right\}\)
\(-10\le\left|5-x\right|\le2\\ \Rightarrow\left|5-x\right|=1;2\\ \Rightarrow5-x=\pm1ho\text{ặ}c5-x=\pm2\\ \)
+) \(5-x=1\\ \Rightarrow x=4\\ \)
+) \(5-x=-1\Rightarrow x=6\)
+) \(5-x=2\Rightarrow x=3\)
+) \(5-x=-2\Rightarrow x=7\\ \)
Vậy \(x\in\left\{4;6;3;7\right\}\)
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a) \(x\in\left\{24;36;48\right\}\)
b) \(x\in\left\{15;30\right\}\)
c) \(x\in\left\{10;20\right\}\)
d) \(x\in\left\{1;2;4;8;16\right\}\)
sorry vì mình chỉ làm tới đây thôi chứ mình phải lo kiếm điểm càng nhanh càng tốt
còn ko thì người ta lấy mất câu hỏi thì mình trả lời làm gì nữa :(
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a) \(x\in\left\{24;36;48\right\}\)
b) \(x\in\left\{15;30\right\}\)
c) \(x\in\left\{1;2;4;8;16\right\}\)
~Chúc pác hok tốt~
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\(2\le\left|x\right|\le5\)
\(\Rightarrow x=\left\{\pm2;\pm3;\pm4;\pm5\right\}\)
Kết luận: vậy ....................
a)x \(\in\){ -5; -4; -3; -2; -1;..;2005;2006;2007;2008;2009;2010}
b)x\(\in\){2004;2005;2006;2007;2008;2009;2010}
c)IxI\(\in\){0;1;2;3;4;5;6}
\(\Rightarrow\)x\(\in\){-6;-5;-4;-3;-2;-1;0;1;2;3;4;5;6}
-5 \(\le\)x\(\le\)2010 nên x \(\in\){-5; -4; -3; -2;...........; 2007; 2008; 2009; 2010}
2004\(\le\)x\(\le\)2010 nên x \(\in\){2004; 2005; 2006; 2007; 2008; 2009; 2010}
IxI \(\le\)6 nên x\(\in\){-6; -5; -4; -3; -2; -1; 0; 1; 2; 3; 4; 5; 6}