Question

Thu gọn 

a   A = 4x ( 3x - 2) - 6x ( x - 3)

b   B = 5x ( x^2 - 2x + 1 ) - x^2 ( 5x - 2)

Answer 1

a) A = 4x(3x - 2 )- 6x(x-3)

       = 12x^2 - 8x - 12x^2 + 18x

       = 10x

b) B = 5x(x^2 - 2x + 1 ) - x^2 (5x-2)

        = 5x^3 - 10x^2 + 5x -5x^3 + 2x^2

       =  -8x^2 + 5x

Answer 2

a, 14x ( 3x - 2 ) - 6x ( x- 3 )

= 14 x ²-8x-6x ²+18 x

= 6x²+ 10 x

b , 5x ( x²-2x +1 ) - x²(5x - 2 )

= 5x ³-10x²+ 5x -5x ³+ 2x²

= -8x²+ 5x

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