题目内容
(2010?龙湖区)计算.(能简算的要简算)
876+1529+124=
10-(9.62-2.8)=
42.8×4×25=
98÷(
÷
)=
÷3+
×
=
÷[(
+
)×
]=
876+1529+124=
10-(9.62-2.8)=
42.8×4×25=
98÷(
| 1 |
| 15 |
| 2 |
| 7 |
| 1 |
| 5 |
| 4 |
| 5 |
| 1 |
| 3 |
| 3 |
| 8 |
| 1 |
| 5 |
| 1 |
| 4 |
| 3 |
| 8 |
分析:算式(1)可据加法交换律及结合律进行简算;算式(3)(4)(6)可据乘法结合律及交换律进行简算;算式(5)可据分配律进行简算.
解答:解:(1)876+1529+124
=(876+124)+1529,
=1000+1529,
=2529;
(2)10-(9.62-2.8)
=10-6.82,
=3.18;
(3)42.8×4×25
=42.8×(4×25),
=42.8×100,
=4280;
(4)98÷(
÷
)
=98×
÷
,
=28×15,
=420;
(5)
÷3+
×
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(6)
÷[(
+
)×
]
=
÷
÷(
+
),
=1÷
,
=
.
=(876+124)+1529,
=1000+1529,
=2529;
(2)10-(9.62-2.8)
=10-6.82,
=3.18;
(3)42.8×4×25
=42.8×(4×25),
=42.8×100,
=4280;
(4)98÷(
| 1 |
| 15 |
| 2 |
| 7 |
=98×
| 2 |
| 7 |
| 1 |
| 15 |
=28×15,
=420;
(5)
| 1 |
| 5 |
| 4 |
| 5 |
| 1 |
| 3 |
=
| 1 |
| 5 |
| 1 |
| 3 |
| 4 |
| 5 |
| 1 |
| 3 |
=(
| 1 |
| 5 |
| 4 |
| 5 |
| 1 |
| 3 |
=1×
| 1 |
| 3 |
=
| 1 |
| 3 |
(6)
| 3 |
| 8 |
| 1 |
| 5 |
| 1 |
| 4 |
| 3 |
| 8 |
=
| 3 |
| 8 |
| 3 |
| 8 |
| 1 |
| 5 |
| 1 |
| 4 |
=1÷
| 9 |
| 20 |
=
| 20 |
| 9 |
点评:完成此类题目要注意分析式中数据的特点及内在联系,然后运用合适的简算方法进行简算.
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