a) 3x.( 5x ² – 2x – 1 ) b) ( x ² + 2xy – 3 ) . ( -xy ) c) c. 1/2 x2y ( 2×3 – 2/5 xy2 -1)

Question

a) 3x.( 5x ² – 2x – 1 )
b) ( x ² + 2xy – 3 ) . ( -xy )
c) c. 1/2 x2y ( 2×3 – 2/5 xy2 -1)

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Alaia 3 tuần 2021-09-09T13:58:27+00:00 2 Answers 3 views 0

Answers ( )

    0
    2021-09-09T13:59:29+00:00

    `a, 3x(5x^2 – 2x – 1)`

    `= 15x^3 – 6x^2 – 3x`

    `b, (x^2 + 2xy – 3)(-xy)`

    `= -x^3y – 2x^2y^2 + 3xy`

    `c, 1/2 x^2y(2x^3 – 2/5 xy^2 – 1)`

    `= x^5y – 1/5 x^3y^2 – 1/2 x^2y`

    0
    2021-09-09T13:59:56+00:00

    a. 3x(5x2 – 2x -1)

    = 3x.5x2 – 3x.2x + 3x.(-1)

    = 15x3 – 6x2 – 3x

    b. (x2+2xy -3)(-xy)

    = (-xy). (x2 +2xy – 3)

    = (- xy).x2 + (- xy).2xy + (- xy).(-3)

    = – x3y – 2x²y2 + 3xy

    c. 1/2 x2y ( 2×3 – 2/5 xy2 -1)

    = x^5 – 1/5 x³y³ – 1/2 x²y

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