Tài liệu 20 Chuyên Đề Bồi Dưỡng HSG Toán 8. 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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font-size:14.0000pt;background:rgb(255,255,0);mso-highlight:rgb(255,255,0)" >CHUY&#202;N &#272;&#7872; 1 - PH&#194;N T&#205;CH &#272;A TH&#7912;C TH&#192;NH NH&#194;N T&#7916;<o:p></o:p>&nbsp;A. &nbsp;M&#7908;C TI&#202;U:<o:p></o:p>* H&#7879; th&#7889;ng l&#7841;i c&#225;c d&#7841;ng to&#225;n v&#224; c&#225;c ph&#432;&#417;ng ph&#225;p ph&#226;n t&#237;ch &#273;a th&#7913;c th&#224;nh nh&#226;n t&#7917;<o:p></o:p>* Gi&#7843;i m&#7897;t s&#7889; b&#224;i t&#7853;p v&#7873; ph&#226;n t&#237;ch &#273;a th&#7913;c th&#224;nh nh&#226;n t&#7917;<o:p></o:p>* N&#226;ng cao tr&#236;nh &#273;&#7897; v&#224; k&#7929; n&#259;ng v&#7873; ph&#226;n t&#237;ch &#273;a th&#7913;c th&#224;nh nh&#226;n t&#7917;<o:p></o:p>B. C&#193;C PH&#431;&#416;NG PH&#193;P V&#192; B&#192;I T&#7852;P<o:p></o:p>I. T&#193;CH M&#7896;T H&#7840;NG T&#7916; TH&#192;NH NHI&#7872;U H&#7840;NG T&#7916;:<o:p></o:p>&#272;&#7883;nh l&#237; b&#7893; sung:<o:p></o:p>+ &#272;a th&#7913;c f(x) c&#243; nghi&#7879;m h&#7919;u t&#7881; th&#236; c&#243; d&#7841;ng p/q trong &#273;&#243; p l&#224; &#432;&#7899;c c&#7911;a h&#7879; s&#7889; t&#7921; do, q l&#224; &#432;&#7899;c d&#432;&#417;ng c&#7911;a h&#7879; s&#7889; cao nh&#7845;t <o:p></o:p>+ N&#7871;u f(x) c&#243; t&#7893;ng c&#225;c h&#7879; s&#7889; b&#7857;ng 0 th&#236; f(x) c&#243; m&#7897;t nh&#226;n t&#7917; l&#224; x – 1<o:p></o:p>+ N&#7871;u f(x) c&#243; t&#7893;ng c&#225;c h&#7879; s&#7889; c&#7911;a c&#225;c h&#7841;ng t&#7917; b&#7853;c ch&#7861;n b&#7857;ng t&#7893;ng c&#225;c h&#7879; s&#7889; c&#7911;a c&#225;c h&#7841;ng t&#7917; b&#7853;c l&#7867; th&#236; f(x) c&#243; m&#7897;t nh&#226;n t&#7917; l&#224; x + 1<o:p></o:p>+ N&#7871;u a l&#224; nghi&#7879;m nguy&#234;n c&#7911;a f(x) v&#224; f(1); f(- 1) kh&#225;c 0 th&#236; <img width="33" height="41" src="https://daythem.com/public/s3/user.document/user-system-generate/toan/lop-8/056e901b1e1dde/html-preview-assets/393360c449c4aa820d30.png" >&nbsp;v&#224; <img width="37" height="41" src="https://daythem.com/public/s3/user.document/user-system-generate/toan/lop-8/056e901b1e1dde/html-preview-assets/f9b7cd80cb34d3eebb85.png" >&nbsp;&#273;&#7873;u l&#224; s&#7889; nguy&#234;n. &#272;&#7875; nhanh ch&#243;ng lo&#7841;i tr&#7915; nghi&#7879;m l&#224; &#432;&#7899;c c&#7911;a h&#7879; s&#7889; t&#7921; do<o:p></o:p>1. V&#237; d&#7909; 1:&nbsp;3x2&nbsp;– 8x + 4<o:p></o:p>C&#225;ch 1:&nbsp;T&#225;ch h&#7841;ng t&#7917; th&#7913; 2<o:p></o:p>3x2&nbsp;– 8x + 4 = &nbsp;3x2&nbsp;– 6x &nbsp;– 2x &nbsp;+ 4 = 3x(x – 2) – 2(x – 2) = (x – 2)(3x – 2)<o:p></o:p>C&#225;ch 2:&nbsp;T&#225;ch h&#7841;ng t&#7917; th&#7913; nh&#7845;t:<o:p></o:p>3x2&nbsp;– 8x + 4 = &nbsp;(4x2&nbsp;– 8x &nbsp;+ 4) &nbsp;- x2&nbsp;= (2x – 2)2&nbsp;– x2&nbsp;= (2x – 2 + x)(2x – 2 – x) <o:p></o:p></div></section>

20 Chuyên Đề Bồi Dưỡng HSG Toán 8

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