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Réponse :

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5x * 3x

= 15x^2

-6x^2 + 4x + 2x + 7x^2 - x^2

= -7x^2 + 7x^2 + 6x

= 6x

x + x

= 2x

(-2x)(-4x)

= 8x^2

(3x + 2) - (3x + 9)

= 3x + 2 - 3x - 9

= -7

x * 6x

= 6x^2

3 - 5x

x * x

= x^2

2x * 4

= 8x

x^2 + 7x - 7(x^2 + x)

= x^2 + 7x - 7x^2 - 7x

= -6x^2

2x(2x + 1)

= 4x^2 + 2x

5x - (2x - 5)

= 5x - 2x + 5

= 3x + 5

-5x^2 + 7 + x + 6x^2 - x^2

= 6x^2 - 6x^2 + x + 7

= x + 7

2(x - 4x)

= 2x - 8x

(-4x^2 + 6x) / (6x^2 - 2x)

= 2x(-x + 3) / [2x(3x - 1)]

= (-x + 3) / (3x - 1)

5 * 3x

= 15x

-5x^2 - 3x^2

= -8x^2

5(-3x)

= -15x

2 + (6 - 2x)

= 2 + 6 - 2x

= -2x + 8

-7x - x

= -8x

(-3x)(-5x)

= 15x^2