问题 填空题
用简便方法计算:
(1)7.292-2.712=______;
(2)
10002
2522-2482
=______.
答案

(1)原式=(7.29+2.71)(7.29-2.71)

=10×4.85

=48.5;

(2)原式=

10002
(252+248)(252-248)

=

10002
500×4

=500.

故答案为48.5;500.

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