Réponse:
O= -4-(11-3)+7
O= -4- 8+7
O= -12 +7
O= -5
1= -(4-11)-3+7
1= -4+11-3+7
1= -4-3+11+7
1= -7 +18
1= 11
Y= (-4-11)-3+7
Y= -15 -3+7
Y= -18 +7
Y= -11
P= -(4-11-3+7)
P= -4+11+3-7
P= -4-7+11+3
P= -11+14
P= 3
U= -(4-11)-(3+7)
U= -4+11 -3-7
U= -4-3-7 +11
U= -14 +11
U= -3