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CHUYÊN ĐỀ BỒI DƯỠNG HSG TOÁN 8 facebook: [email protected] Chúc các em chăm ngoan – học giỏi !! Trang 2 HD: Ta có: 22219999.39999(2999910000)(2999910000)299991000029999AB Bài 3: Rút gọn các biểu thức sau a. 264(21)(21)...(21)1A b. 264(31)(31)...(31)1B c. 222()()2()Cabcabcab HD: a. 264264128128(21)(21)...(21)1(21)(21)(21)...(21)12112A b. 128 2642641281131 (31)(31)...(31)1(31)(31)(31)...(31)1(31)1 222B  c. 222 22 ()()2() ()2()()()2()() Cabcabcab abcabcabcabcabcabc    2 22 22 22222 2() ()2-2 4()2()22()2 ab abcabcabcab ababcabc     Bài 4: Chứng minh rằng a. 222222()()()abxybxayaxby b. 2222222222()()()()()abcxyzaxbyczbxaycybzazcx HD: a. Ta có: VT = 2222222222222222()()()()(ax)()abxyaxaybxbybxayby 222222()2.()2.(ax)()()()bxbxayaybxaybybxayaxbydpcm b. VT = 2222222222222()()()()2zzabxyabzcxyzaxbyaxbycc  222222222=()()()()()()()2.2.axbybxayazbzcxcyczaxbyczaxczbycz 22222222 ()[(cy)2.()]+(az)()2.()()()bxaybyczbzcxazcxbxaycybzazcx

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