题目内容
2011
|
4.8×
| ||||||||||
|
2.28×17%+2.28×
|
分析:(1)把分数化为假分数,把除法改为乘法,约分即可;
(2)把除法改为乘法,运用乘法分配律简算;
(3)根据数字特点,原式变为4.8×
+4.8×
,运用乘法分配律简算;
(4)根据数字特点,原式变为2.28×0.17+2.28×0.5+2.28×0.33,运用乘法分配律简算.
(2)把除法改为乘法,运用乘法分配律简算;
(3)根据数字特点,原式变为4.8×
| 3 |
| 7 |
| 4 |
| 7 |
(4)根据数字特点,原式变为2.28×0.17+2.28×0.5+2.28×0.33,运用乘法分配律简算.
解答:解:(1)2011
÷2011,
=
×
,
=
×
,
=
;
(2)4.8×
+4.8÷
,
=4.8×
+4.8×
,
=4.8×(
+
),
=4.8×1,
=4.8;
(3)
×
+
×
,
=
×
+
×
,
=
×(
+
),
=
×1,
=
;
(4)2.28×17%+2.28×
+0.228×3.3,
=2.28×0.17+2.28×0.5+2.28×0.33,
=2.28×(0.17+0.5+0.33),
=2.28×1,
=2.28.
| 2011 |
| 2012 |
=
| 2011×2012+2011 |
| 2012 |
| 1 |
| 2011 |
=
| 2011×(2012+1) |
| 2012 |
| 1 |
| 2011 |
=
| 2013 |
| 2012 |
(2)4.8×
| 3 |
| 7 |
| 7 |
| 4 |
=4.8×
| 3 |
| 7 |
| 4 |
| 7 |
=4.8×(
| 3 |
| 7 |
| 4 |
| 7 |
=4.8×1,
=4.8;
(3)
| 13 |
| 17 |
| 5 |
| 19 |
| 14 |
| 17 |
| 13 |
| 19 |
=
| 13 |
| 17 |
| 5 |
| 19 |
| 13 |
| 17 |
| 14 |
| 19 |
=
| 13 |
| 17 |
| 5 |
| 19 |
| 14 |
| 19 |
=
| 13 |
| 17 |
=
| 13 |
| 17 |
(4)2.28×17%+2.28×
| 1 |
| 2 |
=2.28×0.17+2.28×0.5+2.28×0.33,
=2.28×(0.17+0.5+0.33),
=2.28×1,
=2.28.
点评:完成此题,注意分析式中数据,运用所学的运算定律或运算技巧,灵活解答.
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