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\begin{enumerate}
\item $\>x\>$��$\>y\>$ ��$10$�ȉ��̎��R���̂Ƃ��C$2$��$1$��������$~2x+y=5~$�̉������ׂċ��߂Ȃ����B

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\item 
 \[ \left\{
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\item $200$�~�̃n���o�[�K�[��$120$�~�̃o�j���V�F�C�N�����킹��$12$�����C
����̍��v�����傤��$2000$�~�ɂ������Ǝv���܂��B
�n���o�[�K�[�ƃo�j���V�F�C�N�����ꂼ�ꉽ�����΂����ł����B
�A����������\fbox{�@�@}�ɂ����ċ��߂Ȃ����B
�K�����𕶎��ɂ����̂��킩��悤�ɂ��Ȃ����B

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\vspace{20mm}
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\item A�����瓻��������B���܂ŉ������܂����B
�s�����A������͎���$3$\ajLig{km}�C
����͎���$5$\ajLig{km}�ŕ����čs������C�s���͂��傤��$2$���ԁC�A���$1$����$44$��������܂����B
A������B���܂œ��̂�͉�\ajLig{km}�ł����B
�A����������\fbox{�@�@}�ɂ����ċ��߂Ȃ����B
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\item ���� $x\>,\>y$ �ɂ��Ă̘A���������̉��̂����C$\>x\>$�̒l��$5$�ł��B
$\>y\>$�̒l�����߂Ȃ����B

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