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

Toán Lớp 8: Phân tích đa thức thành nhân tử 1/4xa^4 + 16xb^4

Toán Lớp 8: Phân tích đa thức thành nhân tử
1/4xa^4 + 16xb^4

Comments ( 2 )

  1. ~ Bạn tham khảo ~
    1/4a^4+16b^4
    =1/4 a^4+1/4*64b^4
    =1/4(a^4+64b^4)
    =1/4(a^4+16a^2b^2+64b^4-16a^2b^2)
    =1/4[(a^2)^2+2a^2 .8b^2+(8b^2)^2-(4ab)^2]
    =1/4[(a^2+8b^2)-(4ab)^2)]
    =1/4(a^2-4ab+8b^2)(a^2+4ab+8b^2)
     

  2. 1/4a^4+16b^4
    =1/4a^4+4a^2b^2+16b^4-4a^2b^2
    =(1/2a^2+4b^2)^2-(2ab)^2
    =(1/2a^2+4b^2-2ab)(1/2a^2+2ab+4b^2)

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