Il faut supprimer les parenthèses et réduire.
Merci !!
A = (a + b)(a - b) + (-a-b) + (-a + b)
B = -(x + 5)-x-2-(-x-4) + (x - 1)
C=3-(a + b)-a-b-3+(3- a - b)
D = 7+ (a + b)+7+c-d-7-(7-x - y)
Merci !!
A = (a + b)(a - b) + (-a-b) + (-a + b)
B = -(x + 5)-x-2-(-x-4) + (x - 1)
C=3-(a + b)-a-b-3+(3- a - b)
D = 7+ (a + b)+7+c-d-7-(7-x - y)
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(a + b)(a - b) + (-a-b) + (-a + b)
= a² - b² - a - b - a + b
= a² - b² - 2a
-(x + 5)-x-2-(-x-4) + (x - 1)
= -x - 5 - x - 2 + x + 4 + x - 1
= -4
3-(a + b)-a-b-3+(3- a - b)
= 3 - a - b - a - b - 3 + 3 - a - b
= 3 - 3a - 3b
7+ (a + b)+7+c-d-7-(7-x - y)
= 7 + a + b + 7 + c - d - 7 - 7 + x + y
= a + b + c - d + x + y