Bonjour,
3/2 - 4/5 (- 7/2)
= 3/2 + 28/10
= 3 x 5 / 2 x 5 + 28/10
= 15/10 + 28/10
= 43/10
(5x - 3) (4 - 3x) - 7x (3x - 5)
= 20x - 15x² - 12 + 9x - 21x² + 35x
= - 15x² - 21x² + 20x + 9x + 35x - 12
= - 36x² + 64x - 12
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Bonjour,
3/2 - 4/5 (- 7/2)
= 3/2 + 28/10
= 3 x 5 / 2 x 5 + 28/10
= 15/10 + 28/10
= 43/10
(5x - 3) (4 - 3x) - 7x (3x - 5)
= 20x - 15x² - 12 + 9x - 21x² + 35x
= - 15x² - 21x² + 20x + 9x + 35x - 12
= - 36x² + 64x - 12