20xx秋上海教育版數(shù)學(xué)七年級上冊95因式分解2-資料下載頁
2024-12-08 05:01本頁面
【導(dǎo)讀】多項式的項數(shù)一般大于三項；分組后各組可利用提取公因式法或公式法或十字相乘法進行分解；各組分解后，整個式子又可繼續(xù)進行因式分解。方公式，或“兩項+兩項”其中的兩項通常要考慮提取公因式或平方差公式。例1、分解因式：bnbmanam???后兩項分為一組先分解，然后再考慮兩組之間的聯(lián)系。
【正文】 ?????????? bababababa )42)(42( ????? baba 3. )1()1(11)1( 33434743 ??????????? xxxxxxxxx )1)(1)(1()1()1)(1( 22243 ????????? xxxxxxx 4. 2222332233 )()( byayxba x ba x yyabxbybyax ??????? ))(()()( 2222 abxyxbayabxyxbabxyay ??????? 【自我測試】 分解因式 ⑴ xyyyxxxyyyxx ????????? 232322 )1()1( )1)(()())(( 222222 ???????????? yxxyyxxyyxxyyxyx ⑵ 222222 931242)3(312)2(2 nmnmnmnmmnmnnm ????????? )32)(32()32()32( 2 mnnmnmnmnmmn ???????? ⑶ 9)2(54445)(4)2)(2( 222 ????????????? yxyxyxyxyxx [ )32)(32( ????? yxyx ⑷ 22222222 )()1(414)1)(1( yxxyxyyxyxxyyx ???????????? )1)(1( yxxyyxxy ??????? ⑸ )1)(1()1()1()1(1 48222428246810 ??????????????? xxxxxxxxxxxxx ])1)[(1()12)(1()1)(1( 42424482482 xxxxxxxxxx ????????????? )21)(1)(1()1)(1)(1( 22424224242 xxxxxxxxxxx ????????????? )1)(1)(1)(1()21)(1)(1( 22242224242 xxxxxxxxxxxxx ??????????????? ⑹ ))(2(3)2(3)2(36363 2223 cabaabaacbaaabccabaa ?????????? ⑺ 12321)1(2 234242 ?????????? aaaaaaaaa 222222222)1()11(]1)1(2)1[(]1232[????????????????aaaaaaaaaaaaaaa 解法二： 22222222222242)1()12)(1()1)(1()1(2)1()1(21)1(2aaaaaaaaaaaaaaaaaaaaaaaa???????????????????????????? ⑻ )2)(2(4)(24 222 ??????????? yxyxyxxyyx ⑼ )44)(1()1)(1(4)1(4443 2222323 ??????????????? xxxxxxxxxxxx 2)2)(1( ??? xx ⑽ 2412147224269 22323 ????????? xxxxxxxx )4)(3)(2()127)(2()2(12)2(7)2( 22 ?????????????? xxxxxxxxxxx
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