Răspuns:
Explicație pas cu pas:
a)-12×[-17+15×(+59-27-30)-21]=
-12×[-17+15×(32-30)-21]=
-12×[-17+15×2-21]=
-12×[-17+30-21]=
-12×[-13-21]=
-12×(-28)=408
b)+29×[-73+21×(-47+11+32)+155]
+29×[-73+21×(-36+32)+155]=
+29×[-73+21×(-4)+155]=
+29×[-73+(-84)+155]=
+29×[-157+155]=
+29×(-2)=-58
c) -31×[+65-37×(-61+26+36)-31]=
-31×[+65-37×(-35+36)-31]=
-31×[+65-37×1-31]=
-31×[+65-37-31]=
-31×[+28-31]=
-31×(-3)=93
