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

Toán Lớp 8: Làm tính nhanh : a ) . ( -2x^3 ) . ( x^2 + 5x – 1 phần 2 ) b) 4x.( 2x^2 + 3x 1 )

Toán Lớp 8: Làm tính nhanh :
a ) . ( -2x^3 ) . ( x^2 + 5x – 1 phần 2 )
b) 4x.( 2x^2 + 3x 1 )

Comments ( 1 )

  1. Giải đáp:
    a ) . ( -2x^3 ) . ( x^2 + 5x – 1/2 )
    = -2x^5 – 10x^4 + x^3
    b) 4x.( 2x^2 + 3x – 1 )
    = 8x^3 + 12x^2 – 4x

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