题目内容
(2012?黔东南州模拟)
| 能简便计算的就简便计算. 41×101= 4141 4141 ; |
3
3 ;
|
2 2 ; | ||||||||||||||||||||
12×(
1 1 ; |
4×
4 4 ; |
|
分析:(1)41×101,运用乘法分配律进行简算;
(2)
÷(
+
)×15,根据分数四则混合运算的顺序,按照分数四则运算的计算法则进行计算;
(3)
+
+
+
,运用加法交换律和结合律进行简算;
(4)12×(
+
-
),运用乘法分配律进行简算;
(5)4×
+4×
,运用乘法分配律进行简算;
(6)
×(
+
),按照分数四则混合运算的顺序进行计算.
(2)
| 1 |
| 5 |
| 2 |
| 3 |
| 1 |
| 5 |
(3)
| 5 |
| 7 |
| 5 |
| 6 |
| 2 |
| 7 |
| 1 |
| 6 |
(4)12×(
| 1 |
| 4 |
| 1 |
| 6 |
| 1 |
| 3 |
(5)4×
| 2 |
| 7 |
| 5 |
| 7 |
(6)
| 1 |
| 15 |
| 1 |
| 3 |
| 1 |
| 12 |
解答:解:(1)41×101,
=41×100+41,
=4100+41,
=4141;
(2)
÷(
+
)×15,
=
÷
×15,
=
×
×15
=
,
=3
;
(3)
+
+
+
,
=(
+
)+(
+
),
=1+1,
=2;
(4)12×(
+
-
),
=12×
+12×
-12×
,
=3+2-4,
=1;
(5)4×
+4×
,
=4×(
+
),
=4×1,
=4;
(6)
×(
+
),
=
×
,
=
.
=41×100+41,
=4100+41,
=4141;
(2)
| 1 |
| 5 |
| 2 |
| 3 |
| 1 |
| 5 |
=
| 1 |
| 5 |
| 13 |
| 15 |
=
| 1 |
| 5 |
| 15 |
| 13 |
=
| 45 |
| 13 |
=3
| 6 |
| 13 |
(3)
| 5 |
| 7 |
| 5 |
| 6 |
| 2 |
| 7 |
| 1 |
| 6 |
=(
| 5 |
| 7 |
| 2 |
| 7 |
| 5 |
| 6 |
| 1 |
| 6 |
=1+1,
=2;
(4)12×(
| 1 |
| 4 |
| 1 |
| 6 |
| 1 |
| 3 |
=12×
| 1 |
| 4 |
| 1 |
| 6 |
| 1 |
| 3 |
=3+2-4,
=1;
(5)4×
| 2 |
| 7 |
| 5 |
| 7 |
=4×(
| 2 |
| 7 |
| 5 |
| 7 |
=4×1,
=4;
(6)
| 1 |
| 15 |
| 1 |
| 3 |
| 1 |
| 12 |
=
| 1 |
| 15 |
| 5 |
| 12 |
=
| 1 |
| 36 |
点评:此题考查的目的是使学生灵活运用加法、乘法的运算定律进行简便计算.
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