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17:26:48

21/11/2024

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DEM0 :

Phương trình bậc hai
AXÂ² + BX + C = 0

A =

B =

C =

X1 =

X2 =

- copy code :
<SCRIPT LANGUAGE="JavaScript">  </SCRIPT> <center> <form name=form> <table border=1 cellpadding=2> <tr> <td colspan=2 align=center><b>Phương trình bậc hai<br>AXÂ² + BX + C = 0</b></td> </tr> <tr> <td> <center><table border=1 width=100% cellpadding=2> <tr> <td align=center><b>A = </b></td> <td align=center><input type=text size=6 name="a"></td> </tr> <tr> <td align=center><b>B = </b></td> <td align=center><input type=text size=6 name="b"></td> </tr> <tr> <td align=center><b>C = </b></td> <td align=center><input type=text size=6 name="c"></td> </tr> </table> </td> <td> <center><table border=1 width=100% cellpadding=2> <tr> <td colspan=2 align=center> <input type=button value="Giải" onClick="quad(this.form)"></td> </tr> <tr> <td align=center><b>X1 = </b></td> <td align=center><input type=text size=6 name="x1"></td> </tr> <tr> <td align=center><b>X2 = </b></td> <td align=center><input type=text size=6 name="x2"></td> </tr> </table> </td> </tr> </table> </form> </center>

Code giải phương trình bậc 2 ẩn
DEM0 :

A1 ?B1 ?C1 ?
A2 ?B2 ?C2 ?
X =Y =
- copy code :
<script language="javascript">function he_pt_bac1_2an(form){ var a1,b1,c1,a2,b2,c2,x,y,d,dx,dy,tong_bp; a1=parseInt(form.a1.value); b1=parseInt(form.b1.value); c1=parseInt(form.c1.value); a2=parseInt(form.a2.value); b2=parseInt(form.b2.value); c2=parseInt(form.c2.value); d = (a1 * b2 - b1 * a2); dx = (c1 * b2 - c2 * b1); dy = (a1 * c2 - c1 * a2); if ((d==dx)&&(dx==dy)&&(dy==0)) { alert("Hai phương trình vô định"); } if(d!=0) { alert("Hai phương trình có một nghiệm duy nhất"); x=parseFloat(dx/d); y=parseFloat(dy/d); form.x.value=eval(x); form.y.value=eval(y); } if ((d==0)&&(dx!=0)||(dx==0)&&(dy!=0)) { alert("Hai phương trình vô nghiệm"); }}</script><br /><form method="post"><br /><center><b>A1 ?</b><input type="text" name ="a1" value="" /><b>B1 ?</b><input type="text" name ="b1" value="" /><b>C1 ?</b><input type="text" name ="c1" value="" /><br /><b>A2 ?</b><input type="text" name= "a2" value="" /><b>B2 ?</b><input type="text" name="b2" value="" /><b>C2 ?</b><input type="text" name="c2" value="" /><br /><b>X =</b><input type="text" name="x" value=" " /><b>Y =</b><input type="text" name="y" value=" " /><br /></center><center><input type="button" value="Giải" onclick="he_pt_bac1_2an(this.form)"; /><input type="reset" value="Xóa Màn Hình" /></center></form>

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