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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 8: rut gon da thuc (2a^2+2a+1)^2.(2a^2-2a+1)^2-(2a^2+1)^2

Toán Lớp 8: rut gon da thuc (2a^2+2a+1)^2.(2a^2-2a+1)^2-(2a^2+1)^2

Comments ( 2 )

  1. Giải đáp:
     (2a^2 + 2a + 1)^2 . (2a^2 – 2a + 1)^2 – (2a^2 + 1)^2
    = (2a^2 + 2a + 1)(2a^2 + 2a +1). (2a^2 – 2a +1)^2 – (2a^2 +1)^2
    = (4a^4 + 4a^3 + 2a^2 + 4a^3 + 4a^2 + 2a + 2a^2 + 2a + 1) .(2a^2 – 2a +1)^2 – 2a^2 + 1)^2
    =( 4a^4 + 8a^3 + 8a^2 + 4a + 1)(2a^2 – 2a +1)( 2a^2 – 2a +1) – (2a^2 + 1)^2
    = (4a^4 + 8a^3 + 8a^2 + 4a +1)(4a^4 – 4a^3 + 2a^2 – 4a^3 + 4a^2 – 2a + 2a^2 – 2a +1) – (2a^2 + 1)^2
    = (4a^4 + 8a^3 + 8a^2 + 4a +1)(4a^4 – 8a^3 + 8a^2 -4a + 1) – ( 4a^4 + 4a^2 + 1)
    = (16a^8 – 32a^7 + 32a^6 – 16a^5 + 4a^4 + 32a^7 – 64a^6 + 64a^5 -32a^4 + 8a^3 + 32a^6 – 64a^5 + 64a^4 – 32a^3 + 8a^2 + 16a^5 – 32a^4 + 32a^3 – 16a^2 + 4a + 4a^4 – 8a^3 + 8a^2 – 4a +1) – (4a^4 + 4a^2 +1)
    =16a^8 + 8a^4 + 1 – 4a^4 – 4a^2 -1
    = 16a^8 + 4a^4 – 4a^2

  2. Xin gửi cho bạn chủ tus ạ 

    Cho mình xin câu trả lời hay nhất nha.          Chúc bạn học tốt 

     

    toan-lop-8-rut-gon-da-thuc-2a-2-2a-1-2-2a-2-2a-1-2-2a-2-1-2

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222-9+11+12:2*14+14 = ? ( )