Repde va rog...........

3•(104•2-12•7)+53
=3•(208-84)+53
=3•124+53
=372+53
=425
b. 3•104•2-12•7+53
=312•2-84+53
=624-84+53
=540+53
=593
c. 3•104-(12•7+53)
=312-(84+53)
=312-137
=175
d. 3•(104-12)•(7+53)
=3•92•60
=276•60
=16.560