题目内容
用简便方法计算.
| (8+40)×25 | (125×25)×(8×4) | 34×102 | 72×125. |
(1)(8+40)×25,
=8×25+40×25,
=200+1000,
=1200;
(2)(125×25)×(8×4),
=(125×8)×(25×4),
=1000×100,
=100000;
(3)34×102,
=34×100+34×2,
=3400+68,
=3468;
(4)72×125,
=9×(8×125),
=9×1000,
=9000.
=8×25+40×25,
=200+1000,
=1200;
(2)(125×25)×(8×4),
=(125×8)×(25×4),
=1000×100,
=100000;
(3)34×102,
=34×100+34×2,
=3400+68,
=3468;
(4)72×125,
=9×(8×125),
=9×1000,
=9000.
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