题目内容
用简便方法计算:
(1)7.292-2.712=______;
(2)
=______.
(1)7.292-2.712=______;
(2)
| 10002 |
| 2522-2482 |
(1)原式=(7.29+2.71)(7.29-2.71)
=10×4.85
=48.5;
(2)原式=
=
=500.
故答案为48.5;500.
=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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