题目内容
简算
|
|
| 99×28%+28% |
考点:运算定律与简便运算
专题:运算定律及简算
分析:(1)(3)(4)根据乘法分配律进行计算;
(2)变形为
×
+
×
,再根据乘法分配律进行计算.
(2)变形为
| 2 |
| 11 |
| 4 |
| 9 |
| 7 |
| 11 |
| 4 |
| 9 |
解答:
解:(1)
×
+
×
-
=
×(
+
-1)
=
×1
=
;
(2)
×
+
×
=
×
+
×
=(
+
)×
=
×
=
;
(3)
×2008
=
×(2007+1)
=
×2007+
=2006+
=2006
;
(4)99×28%+28%
=(99+1)×28%
=100×28%
=28.
| 3 |
| 7 |
| 5 |
| 8 |
| 11 |
| 8 |
| 3 |
| 7 |
| 3 |
| 7 |
=
| 3 |
| 7 |
| 5 |
| 8 |
| 11 |
| 8 |
=
| 3 |
| 7 |
=
| 3 |
| 7 |
(2)
| 4 |
| 11 |
| 2 |
| 9 |
| 7 |
| 11 |
| 4 |
| 9 |
=
| 2 |
| 11 |
| 4 |
| 9 |
| 7 |
| 11 |
| 4 |
| 9 |
=(
| 2 |
| 11 |
| 7 |
| 11 |
| 4 |
| 9 |
=
| 9 |
| 11 |
| 4 |
| 9 |
=
| 4 |
| 11 |
(3)
| 2006 |
| 2007 |
=
| 2006 |
| 2007 |
=
| 2006 |
| 2007 |
| 2006 |
| 2007 |
=2006+
| 2006 |
| 2007 |
=2006
| 2006 |
| 2007 |
(4)99×28%+28%
=(99+1)×28%
=100×28%
=28.
点评:考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算定律简便计算.
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