题目内容
计算,能简算的要简算.
(1)2-
×
×
(2)49×
+
(3)
-
×
(4)37×
.
(1)2-
| 3 |
| 7 |
| 14 |
| 15 |
| 1 |
| 2 |
(2)49×
| 3 |
| 10 |
| 3 |
| 10 |
(3)
| 5 |
| 6 |
| 5 |
| 6 |
| 2 |
| 5 |
(4)37×
| 5 |
| 36 |
考点:分数的简便计算,分数的四则混合运算
专题:运算顺序及法则,运算定律及简算
分析:①按分数、整数四则混合运算顺序计算.
②③④应用乘法分配律简便计算即可.
②③④应用乘法分配律简便计算即可.
解答:
(1)2-
×
×
=2-
=1
(2)49×
+
=
×(49+1)
=
×50
=15
(3)
-
×
=
×(1-
)
=
×
=
(4)37×
=(36+1)×
=5+
=5
| 3 |
| 7 |
| 14 |
| 15 |
| 1 |
| 2 |
=2-
| 1 |
| 5 |
=1
| 4 |
| 5 |
(2)49×
| 3 |
| 10 |
| 3 |
| 10 |
=
| 3 |
| 10 |
=
| 3 |
| 10 |
=15
(3)
| 5 |
| 6 |
| 5 |
| 6 |
| 2 |
| 5 |
=
| 5 |
| 6 |
| 2 |
| 5 |
=
| 5 |
| 6 |
| 3 |
| 5 |
=
| 1 |
| 2 |
(4)37×
| 5 |
| 36 |
=(36+1)×
| 5 |
| 36 |
=5+
| 5 |
| 36 |
=5
| 5 |
| 36 |
点评:此题主要考查分数的四则混合运算的运算顺序和应用运算定律进行简便计算.
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