问题 解答题
估算.
67245+72458≈98210+33871≈87654-12345≈
答案

(1)67245+72458,

≈67000+72000,

=139000;

(2)98210+33871,

≈98000+34000,

=132000;

(3)87654-12345,

≈88000-12000,

=76000;

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