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估算.123+499≈512-369≈553+283≈993-705≈356+248≈937-495≈.

题目详情
估算.
123+499≈___              512-369≈___
553+283≈___              993-705≈___
356+248≈___              937-495≈___.
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答案和解析
123+499
≈120+500
=620

512-369
≈510-370
=140

553+283
≈550+280
=830

993-705
≈1000-700
=300

356+248
≈360+250
=610

937-495
≈940-500
=440
故答案为:620,140,830,300,610,440.