题目内容
| 用简便方法计算下面各题. 87+124+13+76 | 487-(187+256) | 125×48 |
| 427×99 | 254×9-54×9 | 6000÷4÷25. |
(1)87+124+13+76,
=(87+13)+(124+76),
=100+200,
=300;
(2)487-(187+256),
=487-187-256,
=300-256,
=44;
(3)125×48,
=125×(8×6),
=125×8×6,
=1000×6,
=6000;
(4)427×99,
=427×(100-1),
=427×100-427×1,
=42700-427,
=42273;
(5)254×9-54×9,
=(254-54)×9,
=200×9,
=1800;
(6)6000÷4÷25,
=6000÷(4×25),
=6000÷100,
=60.
=(87+13)+(124+76),
=100+200,
=300;
(2)487-(187+256),
=487-187-256,
=300-256,
=44;
(3)125×48,
=125×(8×6),
=125×8×6,
=1000×6,
=6000;
(4)427×99,
=427×(100-1),
=427×100-427×1,
=42700-427,
=42273;
(5)254×9-54×9,
=(254-54)×9,
=200×9,
=1800;
(6)6000÷4÷25,
=6000÷(4×25),
=6000÷100,
=60.
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