Răspuns:
a)-3[1-3(-3+2×5)]
-3[1-3(-3+10)]
-3(1-3×7)
-3(1-21)
-3(-20)
=60
b)-5[-1+2(-7+3×5)+6]
-5[-1+2(-7+15)+6]
-5(-1+2×8+6)
-5(-1+10+6)
-5×21
= -105
c)-1[-8(-3+2×4)+6]-11
-1[-8(-3+8)+6]-11
-1(-8×5+6)-11
-1(-40+6)-11
-1(-34)-11
34-11
=23
d)-2[-5-1(-3+2×1)]-7(-1)
-2[-5-1(-3+2)]-7(-1)
-2[-5-1(-1)]+7
-2(-5+1)+7
-2(-4+7)
8+7
=15
