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type=numbers gapfill
textarea="explain"
iEdit="explain"
random="a b c d"
computed="ans"
asis="explain"

:´ø 4 ¸öËæ»ú²ÎÊýµÄÊýÖµÎÊÌâ.

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<p class="wims_credits">Ä£¿é×÷Õß: <a href="mailto:qualite@wimsedu.info">Gang Xiao</a></p>

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ÄÇôҲÇëɾȥÕâ¸öÍ·²¿, ·ñÔòÓпÉÄܻز»µ½ Createxo.

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:\title{4 ¸ö²ÎÊý}
:\author{XIAO Gang}
:\email{qualite@wimsedu.info}

:µÚÒ»¸ö²ÎÊý \a.
\real{a=randint(-20..20)}

:µÚ¶þ¸ö²ÎÊý \b.
\real{b=randint(-20..20)}

:µÚÈý¸ö²ÎÊý \c.
\real{c=randint(-20..20)}

:µÚËĸö²ÎÊý \d.
\real{d=randint(-20..20)}

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\real{ans=(\a)*(\d) - (\b)*(\c)}

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$embraced_randitem
\text{explain=
¼ÆËã¾ØÕó \([\a,\b;\c,\d]) µÄÐÐÁÐʽ.
}

:%% ¼ÆËã; ²»Òª¸Ä¶¯
\text{explain=wims(embraced randitem \explain)}

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::Ò»°ãÇé¿öÏÂûÓбØÒª¸Ä¶¯Ëü

\statement{\explain
}

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\answer{ÎҵĻشð}{\ans}{type=number}