(1)480÷32-15 =15-15 =0 (2)40×(38+12) =40×50 =2000 (3)54+87+13 =54+(87+13) =54+100 =154 (4)25×24 =25×(4×6) =25×4×6 =100×6 =600 (5)290-186-14 =290-(186+14) =290-200 =90