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Sagot :

Bonjour,

3 × x × (-5 × x) + 2 × x × (-7y) = 3x × (-5x) + 2x × (-7y) = -15x² - 14xy

2t² × t + 5t × (-4t) = 2t³ - 20t²

(2 × 4 × a + 5) × (3 - 7 × a) = (8a+5) ×(3-7a) = 24a-56a²+15-35a

                                                                    = -56a²-11a+15

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