Carry out the following operations as if they were calculations of experimental results, and express each answer in the correct units with the correct number of significant figures:
(a) 7.310 km÷ 5.70 km
(b) (3.26 × 10-3 mg) − (7.88 × 10-5 mg)
(c) (4.02 × 106 dm) + (7.74 − 107 dm)
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