题目内容
计算下面各题,第一行用简便方法计算.
| 745-179-21 | 125×66×8 | 7200÷45÷2 |
| 350÷70+11×25 | (750+240)÷(20-5) | (501-432)÷23. |
(1)745-179-21,
=745-(179+21),
=745-200,
=545;
(2)125×66×8,
=(125×8)×66,
=1000×66,
=66000;
(3)7200÷45÷2,
=7200÷(45×2),
=7200÷90,
=80;
(4)350÷70+11×25,
=5+275,
=280;
(5)(750+240)÷(20-5),
=990÷15,
=66;
(6)(501-432)÷23,
=69÷23,
=3.
=745-(179+21),
=745-200,
=545;
(2)125×66×8,
=(125×8)×66,
=1000×66,
=66000;
(3)7200÷45÷2,
=7200÷(45×2),
=7200÷90,
=80;
(4)350÷70+11×25,
=5+275,
=280;
(5)(750+240)÷(20-5),
=990÷15,
=66;
(6)(501-432)÷23,
=69÷23,
=3.
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