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一种函数的计算方法并给出相应的曲线图片
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广告招租，e-mail:yesize@hotmail.com <SCRIPT LANGUAGE=JavaScript> <!-- Begin var a, b, c; function xtop(form) { form.u.value = (form.b.value * -1) / (form.a.value * 2); } function ytop(form) { form.u2.value = -1 * (form.b.value * form.b.value) / (4 * form.a.value) - (-1 * form.c.value); } function doCoord(form) { form.co.value = form.u.value + , + form.u2.value; } function disc(form) { form.o.value = (form.b.value * form.b.value) - (form.a.value * form.c.value * 4); } function zeroes1(form) { form.n.value = ((form.b.value * -1) - (Math.sqrt(form.o.value))) / (form.a.value * 2); } function zeroes2(form) { form.n2.value = ((form.b.value * -1) - (-1 * Math.sqrt(form.o.value))) / (form.a.value * 2); } function move_in(img_name,img_src) { document[img_name].src=img_src; } // End --> </script> <form> <table bgcolor=#C0C0C0 cellspacing=2 cellpadding=2 border=3> <tr> <td> <b> <h3>Parabolic Calculator</h3> <input name=a size=3>X<sup>2</sup>+ <input name=b size=3>X + <input name=c size=3> <br> <input type=button value=x-top name=x-top onclick=xtop(this.form)> <input type=button value=y-top name=y-top onclick=ytop(this.form)> <input type=button value=crd name=crd onclick=doCoord(this.form)> <input type=button value=disc. name=D onclick=disc(this.form)> <br> <input type=button value=0-points name=zeroes onclick=zeroes1(this.form);zeroes2(this.form)> <input type=button onclick=xtop(this.form);ytop(this.form);doCoord(this.form);disc(this.form);zeroes1(this.form);zeroes2(this.form) value=do all> <input type=button name=pics value=show e.g. onClick=if(form.a.value>0 && form.o.value>0)move_in(p,p2.gif);if (form.a.value<0 && form.o.value>0)move_in(p,p3.gif); if(form.a.value>0 && form.o.value==0) move_in(p,p4.gif); if(form.a.value<0 && form.o.value==0) move_in(p,p5.gif); if(form.a.value>0 && form.o.value<0) move_in(p,p6.gif); if(form.a.value<0 && form.o.value<0) move_in(p,p7.gif) value=show e.g.> <br> <input type=text name=u size=8> x-top<br> <input type=text name=u2 size=8> y-top<br> <input type=text size=8 name=co onmouseover=form.rem.value=form.co.value> Coord.<br> <input type=text size=8 name=o> Discriminant<br> <input type=text size=8 name=n> neg zero pt.<br> <input type=text size=8 name=n2> pos zero pt. <input type=hidden value= name=rem><br> <input type=reset value=reset><br> </b> </td> <td><img src=p1.gif width=200 name=p height=200 border=0 alt=></td> </tr> </table> </form>
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