Sagot :
A = 7-5- (2-3+4)
= 2-2+3-4
= -1
C = -1-4+2-2+3
= -7+5 = -2
A = a- (b-c)+d
= -2-(2+3)+4
= -2+2-3+4 = -12
B = -a-b-(c-d)
2-2-(-3-4)
= 2-2+3+4
= 7
A=-(-7+5)-[2-(3-4)] C=-1-(4-(-2))+(-2+3)
=-(-2)-[2-(-1) ] =-1-(4-(-2))+1
=2-(3) =1-(6)+1
=-1 =-4
A=a-(b-c)+d
=-2-(2-(-3))+4
=-2-5+4
=-7+4
=-3
B=-(-2)-2-(-3-4)
=-(-2)-2+7
=-4+7
=3