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{[2×8×5-2×15)-25]:5+[(5×20:10-4×5:2)]:5}×3=


Răspuns :

{[(2×8×5-2×15)-25]:5+[(5×20:10-4×5:2)]:5}×3=
={[(16×5-30)-25]:5+[(100:10-20:2)]:5}×3=
={[(80-30)-25]:5+[(10-10)]:5}×3=
=[(50-25):5+0:5]×3=
=(25:5+0)×3=
=5×3=
=15