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Sagot :

Bonjour,

Développer ?

A=(3x-1)(2x-2)+(1-3x) (3x+5)

A = 6x² - 6x - 2x + 2 + 3x + 5 - 9x² - 15x

A = 6x² - 9x² - 6x - 2x - 15x + 3x + 2 + 5

A = - 3x² - 20x + 7

B=(2-x)(x+3)-(x-2)(2x-5)​

B = 2x + 6 - x² - 3x - (- 2x - 5x - 4x + 10)

B = 2x + 6 - x² - 3x + 2x + 5x + 4x - 10

B = - x² + 2x + 2x + 5x + 4x - 3x + 6 - 10

B = - x² + 10x - 4.

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