Bonsoir !
3x²(5-5x)
= 15x² - 15x³
2x (x+2)- 3x (x-1) (2x+3)
= 2x² + 4x - 3x(2x² - 2x + 3x - 3)
= 2x² + 4x - 6x³ + 6x² - 9x² + 9x
= -x² - 6x³ + 13x
(2/3x + 1/3)²
= 4/9x² + 4/9x + 1/9
2x-3 (11x+8)²
= 2x - 3 (121x² + 176x + 64)
= 2x - 363x² - 528x - 192
= -363x² - 526x - 192
J'espère t'avoir aidé. Bon courage !
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Bonsoir !
3x²(5-5x)
= 15x² - 15x³
2x (x+2)- 3x (x-1) (2x+3)
= 2x² + 4x - 3x(2x² - 2x + 3x - 3)
= 2x² + 4x - 6x³ + 6x² - 9x² + 9x
= -x² - 6x³ + 13x
(2/3x + 1/3)²
= 4/9x² + 4/9x + 1/9
2x-3 (11x+8)²
= 2x - 3 (121x² + 176x + 64)
= 2x - 363x² - 528x - 192
= -363x² - 526x - 192
J'espère t'avoir aidé. Bon courage !