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

Toán Lớp 8: 1 tính 6x^2y(3xy-2y^2x +y) ( 4x^2 + 5x – 1 )(2x^3 – 3)

Toán Lớp 8: 1 tính
6x^2y(3xy-2y^2x +y)
( 4x^2 + 5x – 1 )(2x^3 – 3)

Comments ( 2 )

  1. Giải đáp:
     $6x²y.(3xy-2y²x+y)$
    $= 6x²y.3xy-6x²y.2y²x+6x²y.y$
    $= 18x³y²-12x²y³+6x²y²$
    $(4x²+5x-1).(2x³-3)$
    $= (4x²+5x-1).2x³-(4x²+5x-1).3$
    $= 8x^5+10x^4-2x³-12x²-15x+3$
     

  2. Đáp án:
     
    Giải thích các bước giải:
     

    toan-lop-8-1-tinh-6-2y-3y-2y-2-y-4-2-5-1-2-3-3

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