题目内容
(
|
17×
|
100×
| ||||||||||||||
|
9
|
34-34×
|
分析:(1)根据乘法分配律进行简算;
(2)17=16+1,然后再根据乘法分配律进行简算;
(3)100=101-1,然后再根据乘法分配律进行简算;
(4)根据乘法分配律进行简算;
(5)9
=8+
,然后再根据乘法分配律进行简算;
(6)根据乘法分配律进行简算.
(2)17=16+1,然后再根据乘法分配律进行简算;
(3)100=101-1,然后再根据乘法分配律进行简算;
(4)根据乘法分配律进行简算;
(5)9
| 3 |
| 5 |
| 8 |
| 5 |
(6)根据乘法分配律进行简算.
解答:解:(1)(
+
)×30,
=
×30+
×30,
=18+2,
=20;
(2)17×
,
=(16+1)×
,
=16×
+1×
,
=3+
,
=3
;
(3)100×
,
=(101-1)×
,
=101×
-1×
,
=100-
,
=99
;
(4)
×
-
×
,
=
×
-
×
,
=
×(
-
),
=0;
(5)9
×
,
=(8+
)×
,
=8×
+
×
,
=1+
,
=1
;
(6)34-34×
,
=34×(1-
),
=34×
,
=
.
| 3 |
| 5 |
| 1 |
| 15 |
=
| 3 |
| 5 |
| 1 |
| 15 |
=18+2,
=20;
(2)17×
| 3 |
| 16 |
=(16+1)×
| 3 |
| 16 |
=16×
| 3 |
| 16 |
| 3 |
| 16 |
=3+
| 3 |
| 16 |
=3
| 3 |
| 16 |
(3)100×
| 100 |
| 101 |
=(101-1)×
| 100 |
| 101 |
=101×
| 100 |
| 101 |
| 100 |
| 101 |
=100-
| 100 |
| 101 |
=99
| 1 |
| 101 |
(4)
| 7 |
| 8 |
| 4 |
| 15 |
| 7 |
| 15 |
| 4 |
| 8 |
=
| 7 |
| 8 |
| 4 |
| 15 |
| 7 |
| 8 |
| 4 |
| 15 |
=
| 7 |
| 8 |
| 4 |
| 15 |
| 4 |
| 15 |
=0;
(5)9
| 3 |
| 5 |
| 1 |
| 8 |
=(8+
| 8 |
| 5 |
| 1 |
| 8 |
=8×
| 1 |
| 8 |
| 8 |
| 5 |
| 1 |
| 8 |
=1+
| 1 |
| 5 |
=1
| 1 |
| 5 |
(6)34-34×
| 26 |
| 27 |
=34×(1-
| 26 |
| 27 |
=34×
| 1 |
| 27 |
=
| 34 |
| 27 |
点评:考查了乘法分配律的灵活运用,然后再进一步解答.
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