题目内容
简算
(1)1.37+
+1.63+
(2)
×
+
÷
.
(1)1.37+
| 9 |
| 11 |
| 2 |
| 11 |
(2)
| 3 |
| 8 |
| 5 |
| 17 |
| 5 |
| 8 |
| 17 |
| 5 |
分析:(1)运用加法结合律简算;
(2)先把除法转化成乘法,再运用乘法分配律简算.
(2)先把除法转化成乘法,再运用乘法分配律简算.
解答:解:(1)1.37+
+1.63+
,
=(1.37+1.63)+(
+
),
=3+1,
=4;
(2)
×
+
÷
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
.
| 9 |
| 11 |
| 2 |
| 11 |
=(1.37+1.63)+(
| 9 |
| 11 |
| 2 |
| 11 |
=3+1,
=4;
(2)
| 3 |
| 8 |
| 5 |
| 17 |
| 5 |
| 8 |
| 17 |
| 5 |
=
| 3 |
| 8 |
| 5 |
| 17 |
| 5 |
| 8 |
| 5 |
| 17 |
=(
| 3 |
| 8 |
| 5 |
| 8 |
| 5 |
| 17 |
=1×
| 5 |
| 17 |
=
| 5 |
| 17 |
点评:此题是考查四则混合运算,要仔细观察算式的特点,灵活运用一些定律进行简便计算.
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