a 92x71-71x83-71x92+83x71=
b 301x78-299x78+303x78-305x78=
c 214x62+148x62-206x62-62x148+12x62=
a) 92x71-71x83-71x92+83x71= 71*(92-83+83-92)= 71*0=0
b 301x78-299x78+303x78-305x78=78*(301-299+303-305)=78*0=0
c 214x62+148x62-206x62-62x148+12x62=62*(214+148-206-148)=62*8=496
a 92x71-71x83-71x92+83x71=6532 - 5893 - 6532 + 5893 = 0
b 301x78-299x78+303x78-305x78= 23478 - 23322 + 23634 - 23790 = 0
c 214x62+148x62-206x62-62x148+12x62= 14268 + 9176 - 12772 - 9176 + 744 = 2240.
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a) 92x71-71x83-71x92+83x71= 71*(92-83+83-92)= 71*0=0
b 301x78-299x78+303x78-305x78=78*(301-299+303-305)=78*0=0
c 214x62+148x62-206x62-62x148+12x62=62*(214+148-206-148)=62*8=496
a 92x71-71x83-71x92+83x71=6532 - 5893 - 6532 + 5893 = 0
b 301x78-299x78+303x78-305x78= 23478 - 23322 + 23634 - 23790 = 0
c 214x62+148x62-206x62-62x148+12x62= 14268 + 9176 - 12772 - 9176 + 744 = 2240.