题目内容
简便运算.
60×(
+
+
)
×17+
×17+
×17
×
+
÷7
101×
-
.
60×(
| 1 |
| 2 |
| 1 |
| 4 |
| 3 |
| 5 |
| 5 |
| 8 |
| 1 |
| 8 |
| 2 |
| 8 |
| 1 |
| 7 |
| 6 |
| 11 |
| 5 |
| 11 |
101×
| 3 |
| 4 |
| 3 |
| 4 |
考点:分数的简便计算
专题:运算定律及简算
分析:(1)运用乘法分配律简算;
(2)(3)(4)逆用乘法分配律简算.
(2)(3)(4)逆用乘法分配律简算.
解答:
解:(1)60×(
+
+
)
=60×
+60×
+60×
=30+15+36
=81
(2)
×17+
×17+
×17
=17×(
+
+
)
=17×1
=17;
(3)
×
+
÷7
=
×
+
×
=
×(
+
)
=
×1
=
;
(4)101×
-
=(101-1)×
=100×
=25.
| 1 |
| 2 |
| 1 |
| 4 |
| 3 |
| 5 |
=60×
| 1 |
| 2 |
| 1 |
| 4 |
| 3 |
| 5 |
=30+15+36
=81
(2)
| 5 |
| 8 |
| 1 |
| 8 |
| 2 |
| 8 |
=17×(
| 5 |
| 8 |
| 1 |
| 8 |
| 2 |
| 8 |
=17×1
=17;
(3)
| 1 |
| 7 |
| 6 |
| 11 |
| 5 |
| 11 |
=
| 1 |
| 7 |
| 6 |
| 11 |
| 5 |
| 11 |
| 1 |
| 7 |
=
| 1 |
| 7 |
| 6 |
| 11 |
| 5 |
| 11 |
=
| 1 |
| 7 |
=
| 1 |
| 7 |
(4)101×
| 3 |
| 4 |
| 3 |
| 4 |
=(101-1)×
| 3 |
| 4 |
=100×
| 1 |
| 4 |
=25.
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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