题目内容
计算下面各题.
5.4×
+3.6÷1
+0.9
×
+
÷
2012÷2012
.
5.4×
| 9 |
| 10 |
| 1 |
| 9 |
| 4 |
| 15 |
| 3 |
| 2 |
| 11 |
| 15 |
| 2 |
| 3 |
2012÷2012
| 2012 |
| 2013 |
分析:(1)把原式变为5.4×
+3.6×
+
,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)把除数化为假分数时,分子不必算出来,因为在计算过程中,要用到约分.
| 9 |
| 10 |
| 9 |
| 10 |
| 9 |
| 10 |
(2)把除法改为乘法,运用乘法分配律简算;
(3)把除数化为假分数时,分子不必算出来,因为在计算过程中,要用到约分.
解答:解:(1)5.4×
+3.6÷1
+0.9,
=5.4×
+3.6×
+
,
=(5.4+3.6+1)×
,
=10×
,
=9;
(2)
×
+
÷
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(3)2012÷2012
,
=2012÷
,
=2012×
,
=
.
| 9 |
| 10 |
| 1 |
| 9 |
=5.4×
| 9 |
| 10 |
| 9 |
| 10 |
| 9 |
| 10 |
=(5.4+3.6+1)×
| 9 |
| 10 |
=10×
| 9 |
| 10 |
=9;
(2)
| 4 |
| 15 |
| 3 |
| 2 |
| 11 |
| 15 |
| 2 |
| 3 |
=
| 4 |
| 15 |
| 3 |
| 2 |
| 11 |
| 15 |
| 3 |
| 2 |
=(
| 4 |
| 15 |
| 11 |
| 15 |
| 3 |
| 2 |
=1×
| 3 |
| 2 |
=
| 3 |
| 2 |
(3)2012÷2012
| 2012 |
| 2013 |
=2012÷
| 2012×2013+2012 |
| 2013 |
=2012×
| 2013 |
| 2012×(2013+1) |
=
| 2013 |
| 2014 |
点评:完成此题,应注意分析数据,运用运算技巧或运算定律,进行简算.
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