题目内容
估算.
| 67245+72458≈ | 98210+33871≈ | 87654-12345≈ |
(1)67245+72458,
≈67000+72000,
=139000;
(2)98210+33871,
≈98000+34000,
=132000;
(3)87654-12345,
≈88000-12000,
=76000;
≈67000+72000,
=139000;
(2)98210+33871,
≈98000+34000,
=132000;
(3)87654-12345,
≈88000-12000,
=76000;
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