j'ai vraiment besoin d'aide aidez moi (1/-2/3+1) x (1/-2/3-1) les / representent les traits de fraction

(1/-2/3 + 1)(1/-2/3 - 1)
= (-3/2+1)(-3/2 -1)
= 9/4+3/2-3/2-1
= 9/4-1
= 9/4-4/4
= 5/4

(1/-2/3+1) x (1/-2/3-1)
= (1 / -2/3+3/3) x (1 / -2/3-3/3)
= (1 / 1/3) x (1/ -5/3)
= (1x3) x( 1 x-3/5)
= 3 x( -3/5)
= -9/5