The fruit shop shipped 45 boxes of pears and 52 boxes of apples. The average weight of each box of pears was 18 kg, and the average weight of each box of apples was 20 kg. How many kilograms of fruit did the fruit shop ship in total?
水果店运来45箱梨和52箱苹果，平均每箱梨重18千克，平均每箱苹果重20千克．水果店共运来多少千克水果？
<gadget id="calculator">45 * 18</gadget>
<output>810</output>

<gadget id="calculator">52 * 20</gadget>
<output>1_040</output>

<gadget id="calculator">810 + 1_040</gadget>
<output>1_850</output>

<result>1_850</result>