Bonjour,
a) 2a + 0 x b - 4 + a
= 2a - 4 +a
= 3a - 4
b) 3a x b - 5a + 7ab
= 3ab + 2ab
= 5ab
c) - c² + 8 - 6c x c - 1 + c x 2c + c (? On ne voit pas la fin...)
= - c² + 8 - 6c² - 1 + 2c² + c
= - 5c² + c + 7
d) d + d x d + d
= 2d x 2d
= 4d².
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Bonjour,
a) 2a + 0 x b - 4 + a
= 2a - 4 +a
= 3a - 4
b) 3a x b - 5a + 7ab
= 3ab + 2ab
= 5ab
c) - c² + 8 - 6c x c - 1 + c x 2c + c (? On ne voit pas la fin...)
= - c² + 8 - 6c² - 1 + 2c² + c
= - 5c² + c + 7
d) d + d x d + d
= 2d x 2d
= 4d².