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

Toán Lớp 8: 2) (x^2 + 4x) (2x^3 -8x^2 +32)

Toán Lớp 8: 2) (x^2 + 4x) (2x^3 -8x^2 +32)

Comments ( 2 )

  1. Giải đáp:
     
    Lời giải và giải thích chi tiết:
    $2,$
    $(x^2+4x)(2x^3 -8x^2 +32)$
    $=2x^5-8x^4+32x^2+8x^4-32x^3+128x$
    $=2x^5-32x^3+32x^2+128x$

  2. (x^2 + 4x)(2x^3 – 8x^2 + 32)
    = x^2(2x^3 – 8x^2 + 32) + 4x . (2x^3 – 8x^2 + 32)
    = 2x^5 – 8x^4 + 32x^2 + 8x^4 – 32x^3 + 128x
    = 2x^5 – 32x^3 + 32x^2 + 128x

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

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