题目内容
| 2 |
| 9 |
| 2 |
| 9 |
10
10
+8
8
)×| 2 |
| 9 |
| 2 |
| 9 |
| 7 |
| 8 |
| 8 |
| 7 |
| 7 |
| 8 |
| 7 |
| 8 |
| 8 |
| 7 |
| 8 |
| 7 |
17
17
.分析:(1)根据乘法分配律简算;
(2)根据乘法交换律简算.
(2)根据乘法交换律简算.
解答:解:(1)
×10+
×8
=( 10+8)×
=18×
=4;
(2)
×17×
=
×
×17
=1×17
=17.
故答案为:10,8,
;
,
,17.
| 2 |
| 9 |
| 2 |
| 9 |
=( 10+8)×
| 2 |
| 9 |
=18×
| 2 |
| 9 |
=4;
(2)
| 7 |
| 8 |
| 8 |
| 7 |
=
| 7 |
| 8 |
| 8 |
| 7 |
=1×17
=17.
故答案为:10,8,
| 2 |
| 9 |
| 7 |
| 8 |
| 8 |
| 7 |
点评:熟记运算定律是解决本题的关键.
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