题目内容
计算:(能简算的要简算)
17×
(
+
)×32
×
+
×
×
×
.
17×
| 9 |
| 16 |
(
| 3 |
| 4 |
| 5 |
| 8 |
| 5 |
| 9 |
| 3 |
| 4 |
| 5 |
| 9 |
| 1 |
| 4 |
| 9 |
| 13 |
| 5 |
| 6 |
| 13 |
| 15 |
考点:分数乘法
专题:运算顺序及法则
分析:(1)把17分解成16+1,再根据乘法分配律进行计算;
(2)(3)根据乘法分配律进行计算;
(4)根据乘法交换律进行计算.
(2)(3)根据乘法分配律进行计算;
(4)根据乘法交换律进行计算.
解答:
解:(1)17×
=(16+1)×
=16×
+
=9+
=9
(2)(
+
)×32
=
×32+
×32
=24+20
=44;
(3)
×
+
×
=
×(
+
)
=
×1
=
;
(4)
×
×
=
×
×
=
| 9 |
| 16 |
=(16+1)×
| 9 |
| 16 |
=16×
| 9 |
| 16 |
| 9 |
| 16 |
=9+
| 9 |
| 16 |
=9
| 9 |
| 16 |
(2)(
| 3 |
| 4 |
| 5 |
| 8 |
=
| 3 |
| 4 |
| 5 |
| 8 |
=24+20
=44;
(3)
| 5 |
| 9 |
| 3 |
| 4 |
| 5 |
| 9 |
| 1 |
| 4 |
=
| 5 |
| 9 |
| 3 |
| 4 |
| 1 |
| 4 |
=
| 5 |
| 9 |
=
| 5 |
| 9 |
(4)
| 9 |
| 13 |
| 5 |
| 6 |
| 13 |
| 15 |
=
| 9 |
| 13 |
| 13 |
| 15 |
| 5 |
| 6 |
=
| 1 |
| 2 |
点评:本题主要考查了学生对乘法运算定律的掌握情况.
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