Tài liệu Một số kinh nghiệm giảng dạy giải bài toán bằng cách lập phương trình. Phân loại: Phổ thông > Toán > Lớp 8. Chủ đề: Toán, Toán 8. Có bản xem trước trang đầu dạng HTML và PDF để tham khảo nội dung.

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.document-html-preview--word div.Section0{page:Section0;}</style><div class="document-html-preview__page document-html-preview__page--word" data-page="1">M&#7896;T S&#7888; KINH NGHI&#7878;M GI&#7842;NG D&#7840;Y <o:p></o:p>GI&#7842;I B&#192;I TO&#193;N B&#7856;NG C&#193;CH L&#7852;P PH&#431;&#416;NG TR&#204;NH<o:p></o:p>1. Gi&#7843;i ph&#225;p :<o:p></o:p>T&#7915; nh&#7919;ng kh&#243; kh&#259;n c&#417; b&#7843;n c&#7911;a h&#7885;c sinh c&#361;ng nh&#432; nh&#7919;ng y&#7871;u t&#7889; kh&#225;ch quan kh&#225;c, t&#244;i &#273;&#227; c&#7889; g&#7855;ng t&#236;m ra nh&#7919;ng gi&#7843;i ph&#225;p kh&#7855;c ph&#7909;c nh&#7857;m &#273;&#7841;t &#273;&#432;&#7907;c hi&#7879;u qu&#7843; cao trong c&#244;ng t&#225;c. N&#7855;m b&#7855;t &#273;&#432;&#7907;c t&#236;nh h&#236;nh h&#7885;c sinh ng&#7841;i kh&#243; khi gi&#7843;i b&#224;i to&#225;n b&#7857;ng c&#225;ch l&#7853;p ph&#432;&#417;ng tr&#236;nh n&#234;n t&#244;i &#273;&#227; &#273;&#432;a ra c&#225;c d&#7841;ng b&#224;i t&#7853;p kh&#225;c nhau &#273;&#7875; ph&#226;n lo&#7841;i cho ph&#249; h&#7907;p v&#7899;i kh&#7843; n&#259;ng nh&#7853;n th&#7913;c c&#7911;a t&#7915;ng &#273;&#7889;i t&#432;&#7907;ng. C&#225;c b&#224;i t&#7853;p &#7903; d&#7841;ng t&#7915; th&#7845;p &#273;&#7871;n cao &#273;&#7875; c&#225;c em nh&#7853;n th&#7913;c ch&#7853;m c&#243; th&#7875; l&#224;m t&#7889;t nh&#7919;ng b&#224;i to&#225;n &#7903; m&#7913;c &#273;&#7897; trung b&#236;nh, &#273;&#7891;ng th&#7901;i k&#237;ch th&#237;ch s&#7921; t&#236;m t&#242;i v&#224; s&#225;ng t&#7841;o c&#7911;a nh&#7919;ng h&#7885;c sinh kh&#225;.<o:p></o:p>B&#234;n c&#7841;nh &#273;&#243; t&#244;i th&#432;&#7901;ng xuy&#234;n h&#432;&#7899;ng d&#7851;n, s&#7917;a ch&#7919;a ch&#7895; sai cho h&#7885;c sinh, l&#7855;ng nghe &#253; ki&#7871;n c&#7911;a c&#225;c em. Cho h&#7885;c sinh ngo&#224;i l&#224;m vi&#7879;c c&#225; nh&#226;n c&#242;n ph&#7843;i tham gia trao &#273;&#7893;i nh&#243;m khi c&#7847;n thi&#7871;t. T&#244;i y&#234;u c&#7847;u h&#7885;c sinh ph&#7843;i t&#7921; gi&#225;c, t&#237;ch c&#7921;c, ch&#7911; &#273;&#7897;ng, c&#243; tr&#225;ch nhi&#7879;m v&#7899;i b&#7843;n th&#226;n v&#224; t&#7853;p th&#7875;. <o:p></o:p>M&#7863;c d&#249; kh&#7843; n&#259;ng nh&#7853;n th&#7913;c v&#224; suy lu&#7853;n c&#7911;a h&#7885;c sinh trong m&#7895;i l&#7899;p ch&#432;a &#273;&#7891;ng b&#7897; nh&#432;ng khi gi&#7843;i b&#224;i to&#225;n b&#7857;ng c&#225;ch l&#7853;p ph&#432;&#417;ng tr&#236;nh t&#7845;t c&#7843; &#273;&#7873;u ph&#7843;i d&#7921;a v&#224;o m&#7897;t quy t&#7855;c chung: &#272;&#243; l&#224; c&#225;c b&#432;&#7899;c gi&#7843;i b&#224;i to&#225;n b&#7857;ng c&#225;ch l&#7853;p ph&#432;&#417;ng tr&#236;nh. C&#7909; th&#7875; nh&#432; sau :<o:p></o:p>* B&#432;&#7899;c 1:&nbsp;L&#7853;p ph&#432;&#417;ng tr&#236;nh (g&#7891;m c&#225;c c&#244;ng vi&#7879;c sau):<o:p></o:p> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;- Ch&#7885;n &#7849;n s&#7889; ( ghi r&#245; &#273;&#417;n v&#7883; ) v&#224; &#273;&#7863;t &#273;i&#7873;u ki&#7879;n cho &#7849;n;<o:p></o:p> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;- Bi&#7875;u di&#7877;n c&#225;c &#273;&#7841;i l&#432;&#7907;ng &nbsp;ch&#432;a bi&#7871;t theo &#7849;n v&#224; c&#225;c &#273;&#7841;i l&#432;&#7907;ng &#273;&#227; bi&#7871;t;<o:p></o:p> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;- L&#7853;p ph&#432;&#417;ng tr&#236;nh bi&#7875;u th&#7883; m&#7889;i quan h&#7879; gi&#7919;a c&#225;c &#273;&#7841;i l&#432;&#7907;ng. <o:p></o:p>* B&#432;&#7899;c 2:&nbsp;Gi&#7843;i ph&#432;&#417;ng tr&#236;nh:Tu&#7923; t&#7915;ng ph&#432;&#417;ng tr&#236;nh m&#224; ch&#7885;n c&#225;ch gi&#7843;i cho ng&#7855;n g&#7885;n v&#224; ph&#249; h&#7907;p.<o:p></o:p>* B&#432;&#7899;c 3:&nbsp;Tr&#7843; l&#7901;i (Ki&#7875;m tra xem trong c&#225;c nghi&#7879;m c&#7911;a ph&#432;&#417;ng tr&#236;nh, nghi&#7879;m n&#224;o th&#7887;a m&#227;n &#273;i&#7873;u ki&#7879;n c&#7911;a &#7849;n, nghi&#7879;m n&#224;o kh&#244;ng r&#7891;i k&#7871;t lu&#7853;n).<o:p></o:p></div></section>

Một số kinh nghiệm giảng dạy giải bài toán bằng cách lập phương trình

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