Toán Lớp 6: tìm các số tự nhiên x, y sao cho :
1) xy = 12
3) xy = 30
4) xy = 36
5) xy = 24
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Toán Lớp 6: tìm các số tự nhiên x, y sao cho :
1) xy = 12
3) xy = 30
4) xy = 36
5) xy = 24
Comments ( 2 )
=>xy in Ư(12)={1;2;3;4;6;12}
$\begin{array}{|c|c|c|}\hline \text{x}&\text{1}&\text{2}&\text{3}&\text{12}&\text{6}&\text{4}\\\hline \text{y}&\text{12}&\text{6}&\text{4}&\text{1}&\text{2}&\text{3}\\\hline \text{12}&\text{12}&\text{12}&\text{12}&\text{12}&\text{12}&\text{12}\\\hline\end{array}$
=>xy in Ư(30)={1;2;3;5;6;10;15;30}
$\begin{array}{|c|c|c|}\hline \text{x}&\text{1}&\text{2}&\text{3}&\text{5}&\text{6}&\text{15}&\text{10}&\text{30}\\\hline \text{y}&\text{30}&\text{15}&\text{10}&\text{6}&\text{5}&\text{2}&\text{3}&\text{1}\\\hline \text{30}&\text{30}&\text{30}&\text{30}&\text{30}&\text{30}&\text{30}&\text{30}&\text{30}\\\hline\end{array}$
=>xy in Ư(36)={1;2;3;4;9;12;18;36}
$\begin{array}{|c|c|c|}\hline \text{x}&\text{1}&\text{2}&\text{3}&\text{4}&\text{36}&\text{18}&\text{12}&\text{9}\\\hline \text{y}&\text{36}&\text{18}&\text{12}&\text{9}&\text{1}&\text{2}&\text{3}&\text{4}\\\hline \text{36}&\text{36}&\text{36}&\text{36}&\text{36}&\text{36}&\text{36}&\text{36}&\text{36}\\\hline\end{array}$
=>xy in Ư(24)={1;2;3;4;6;8;12;24}
$\begin{array}{|c|c|c|}\hline \text{x}&\text{1}&\text{2}&\text{3}&\text{4}&\text{24}&\text{12}&\text{8}&\text{6}\\\hline \text{y}&\text{24}&\text{12}&\text{8}&\text{6}&\text{1}&\text{2}&\text{3}&\text{4}\\\hline \text{24}&\text{24}&\text{24}&\text{24}&\text{24}&\text{24}&\text{24}&\text{24}&\text{24}\\\hline\end{array}$