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To find out how much heavier Sharon's laptop is compared to her phone, we need to subtract the weight of her phone from the weight of her laptop.
Weight of laptop: 3x10^6 milligrams
Weight of phone: 2x10^5 milligrams
3x10^6 - 2x10^5 = 3,000,000 - 200,000 = 2,800,000 milligrams
Therefore, Sharon's laptop is 2,800,000 milligrams (or 2.8 grams) heavier than her phone.