题目内容
用简便方法计算
×98;
+
+
+
;
÷1
+
×
.
| 95 |
| 97 |
| 2 |
| 5 |
| 5 |
| 6 |
| 3 |
| 5 |
| 1 |
| 6 |
| 3 |
| 4 |
| 1 |
| 5 |
| 1 |
| 4 |
| 5 |
| 6 |
考点:分数的简便计算
专题:运算定律及简算
分析:(1)运用乘法的分配律进行简算;
(2)运用加法的交换律、结合律进行简算;
(3)把除以1
化成乘以
,再运用乘法的分配律进行简算.
(2)运用加法的交换律、结合律进行简算;
(3)把除以1
| 1 |
| 5 |
| 5 |
| 6 |
解答:
解:(1)
×98
=
×(97+1)
=
×97+
×1
=95+
=95
;
(2)
+
+
+
=
+
+
+
=(
+
)+(
+
)
=1+1
=2;
(3)
÷1
+
×
=
×
+
×
=(
+
)×
=1×
=
.
| 95 |
| 97 |
=
| 95 |
| 97 |
=
| 95 |
| 97 |
| 95 |
| 97 |
=95+
| 95 |
| 97 |
=95
| 95 |
| 97 |
(2)
| 2 |
| 5 |
| 5 |
| 6 |
| 3 |
| 5 |
| 1 |
| 6 |
=
| 2 |
| 5 |
| 3 |
| 5 |
| 1 |
| 6 |
| 5 |
| 6 |
=(
| 2 |
| 5 |
| 3 |
| 5 |
| 1 |
| 6 |
| 5 |
| 6 |
=1+1
=2;
(3)
| 3 |
| 4 |
| 1 |
| 5 |
| 1 |
| 4 |
| 5 |
| 6 |
=
| 3 |
| 4 |
| 5 |
| 6 |
| 1 |
| 4 |
| 5 |
| 6 |
=(
| 3 |
| 4 |
| 1 |
| 4 |
| 5 |
| 6 |
=1×
| 5 |
| 6 |
=
| 5 |
| 6 |
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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