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<h3>OEFʽ½ʽϰ</h3>
ǿ<b>ϰ</b>(createxo)Ľʽϰ.
<ol>
<li> <hr style="width:50%"/>
<b>2άij</b>, ƽijȵļ.
ϰԴ.
<pre>
\title{2άķ}
\language{cn}
\computeanswer{no}
\format{html}
\integer{x=random(-10..10)}
\integer{y=random(-10..10)}
\real{norm=sqrt((\x)^2+(\y)^2)}
\statement{R<sup>2</sup>(\x,\y)ijʲô?}
\hint{(x,y)ijȵsqrt(x^2+y^2).}
\answer{}{\norm}
</pre>
ϰ, xy, .
ʵ, ɳȹʽȷ. ϰȡɸʽĻش,
``'', ȷشӦǵ``''ֵ.
ϰһʾ, ϰ˳ȹʽ. <p>
!set parm=oef_answercnt=1&oef_choicecnt=0&oef_title=2άķ&oef_format=html&oef_computeanswer=no&level=2&oef_parms=%5Cinteger%7Bx%3Drandom%28-10..10%29%7D%0D%0A%5Cinteger%7By%3Drandom%28-10..10%29%7D%0D%0A%5Creal%7Bnorm%3Dsqrt%28%28%5Cx%29%5E2%2B%28%5Cy%29%5E2%29%7D&oef_statement=R%3Csup%3E2%3C%2Fsup%3E%28%5Cx%2C%5Cy%29ijʲô&ansprompt1=&ansgood1=%5Cnorm&oef_hint=%28x%2Cy%29ijf%0D%0Asqrt%28x%5E2%2By%5E2%29.&oef_solution= $
!href cmd=reply&mode=guided&$parm Ӷ˵
Բ. (ҲԴģʽ°Դ븴˵.)
<li> <hr style="width:50%"/>
<b>2x2ļ</b>, ļ. ϰԴ.
<pre>
\title{2x2ļ}
\language{cn}
\computeanswer{yes}
\format{html}
\integer{range=20}
\integer{a=random(-\range..\range)}
\integer{b=random(-\range..\range)}
\integer{c=random(-\range..\range)}
\integer{d=random(-\range..\range)}
\integer{trace=(\a)+(\d)}
\statement{¾ļ<center>
\(\pmatrix{\a&\b\cr \c&\d}).</center>}
\answer{}{\trace}
</pre> <p>
ȶ``range''Ԫa,b,c,dֵĽ.
ļȻΪԽԪ֮. עⶨ
<span class="tt">trace=(\a)+(\d)</span>: ŶDZҪ, Ϊ滻ǰִе.
㶨<span class="tt">trace=\a+\d</span>, abֱȡֵ3-15,
㽫õ<span class="tt">trace=3+-15</span>, һѧʽ. <p>
עϰδĻش
(2+153*105). <p>
!set parm=oef_answercnt=1&oef_choicecnt=0&oef_title=2x2ļ&oef_format=html&oef_computeanswer=yes&level=2&oef_parms=%5Cinteger%7Brange%3D20%7D%0D%0A%5Cinteger%7Ba%3Drandom%28-%5Crange..%5Crange%29%7D%0D%0A%5Cinteger%7Bb%3Drandom%28-%5Crange..%5Crange%29%7D%0D%0A%5Cinteger%7Bc%3Drandom%28-%5Crange..%5Crange%29%7D%0D%0A%5Cinteger%7Bd%3Drandom%28-%5Crange..%5Crange%29%7D%0D%0A%5Cinteger%7Btrace%3D%28%5Ca%29%2B%28%5Cd%29%7D&oef_statement=¾ļ%3Ccenter%3E%0D%0A%5C%28%5Cpmatrix%7B%5Ca%26%5Cb%5Ccr %5Cc%26%5Cd%7D%29.%3C%2Fcenter%3E&ansprompt1=&ansgood1=%5Ctrace&oef_hint= &oef_solution= $
!href cmd=reply&mode=guided&$parm Ӷ˵
Բ. (ҲԴģʽаԴ븴˵.)
</ol>
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