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

Toán Lớp 8: PTDTTNT $(8 -2x^2)^2-18.(x-2)(x+2)$

Toán Lớp 8: PTDTTNT $(8 -2x^2)^2-18.(x-2)(x+2)$

Comments ( 1 )

  1. Giải đáp+Lời giải và giải thích chi tiết:
    (8-2x^2)^2-18(x-2)(x+2)
    =(8-2x^2)(8-2x^2)-18(x-2)(x+2)
    =4(4-x^2)(4-x^2)-18(x-2)(x+2)
    =-4(x^2-4)(4-x^2)-18(x-2)(x+2)
    =(-16+4x^2)(x-2)(x+2)-18(x-2)(x+2)
    =(x-2)(x+2)(-16+4x^2-18)
    =(x-2)(x+2)(4x^2-34)
    =2(x-2)(x+2)(2x^2-17)

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